Check My Work!!!
October12
While grading student papers, I noticed that while computing the product of 4.5 and 1.2, this student carefully lined up the decimals and then multiplied, bringing the decimal point straight down and reporting a product of 54.0.
Is this solution correct or incorrect? Defend your choice either way with a DETAILED explanation as to why this student was correct or incorrect in solving this math problem!
It is correct. Because 4.5×1.2 is54.0 and because5x2=10and 4×2 +1 =9 45×1=45 90+45=54.0 because 90
+45
—-
54.0
Michelle, Are the rules for adding decimals and multiplying decimals the same?
If you add the decimals and bring it down it would be54.0
I think he solution is incorrect because first of all, when multiplying decimals you do not line up the decimal you would line up the problem like a regular multiplication problem like as if the decimals are not there. Second of all when you have your answer you do not bring the decimal straight down, you are suppose to start at the decimal and count how many spaces to the right it would take to get the the end and in this problem is took 2 spaces to get to the end. So you go to your answer and you go to the end, then you would count to the left the 2 spaces that you counted at the top and that is where you decimal place would be.
This solution is incorrect. The problem is right, but how they did they answered it is wrong.
For some reason they forgot a IMPORTANT part.
WHEN YOUR MULTIPLYING DECIMALS, YOU COUNT HOWEVER MANY NUMBERS ARE ON THE RIGHT SIDE OF THE DECIMAL.
There are two numbers on the right side of the decimals: .5 and .2.
So this persons answer is 54.0 when is should be 5.4.
SamanthaB
The answer is wrong because when you look at the product the answer 54.0 which the number is correct but not where the decimal is placed. Also I know it is incorrect because in the problem 4.5 x 2.1 there are two decimals. Then instantly I know that you have to move the decimal twice in you answer. In conclusion the answer is wrong because the answer in the problem is has the decimal only moved once and th correct answer should be 5.40.
You don’t have to line up the decimals. All you have to do is ignore the decimals and multiply a substitute of 45 and 12 and then add the two decimals at the end, making the answer 5.4 in the end.
Christian, How do you add the decimals at the end?
It’s incorecct because 4.5 * 1.2 = 5.4
If they didnt have the right answer that means that the whole answer that they put in is wrong because of how they did it.
(last time i ust times it and put the answer down without doing the right math)
its correct because 4.5 * 1.2 = .90 because you put the decimal in two times a side. And then you keep on doing the same progress with the RIGHT answer that you get.
Ashleigh, I don’t understand your answer. Can you please reread it and resubmit!
the multiplacation is correct but the answer is incorrect. what you would do is count how many numbers there are behind the decimals. since there are 2 numbers behind the decimal thats how many numbers wouuld be behind the decimal in your answer. so the answer is 5.40
Oh no! Who does this post belong to?
the solution of th students problem is incorrect because the decimal is not in the right place, the multiplying corectly but the student didnt count the all of the numbers after the decimal to know where to place it . If the student would have just placed the decimal correctly he would have the awenser corectly.
the solution of the students problem is i think incorrect because the decimal is in the wrong place, but the multiplying is correct and the student did not count all of the numbers after the decimlto see where to place the decimal. The student would have got this problem right if he or she would have put the decimal in the right place.
I think that the problem is incorrect,because if you have 2 decimal places you take the decimal 2 places to the left.And when you add you just bring the decimal down.But the person is not adding he/she is multiplying.The only mistake is the decimal it placed wrong he/she said 54.0 when is supposed to be 5.40.But the math is correct.Thats why that incorrect.
when you add a decimal you bring it down you are no going to do the same with a mutply problm so you add the decimal 2 and move 2 spaces to the left it will be 5.40
Alexa, What do you mean by “add the decimal 2 and move 2 spaces to the left”?
The way the student got the answer is correct, but the way the student wrote the solution is incorrect. the reason I say this i because, when they start to multiply 1 (from 1.2), they need to add a Zero before they begin to multiply the numbers. The reason it is important,is because you aways need to bring down the zero to get the correct answer.
Do you always have to line up the decimals when you do decimal operations Natalia?
That is the wrong place for the decimal to be. Because you line up the decimals when your adding or subtracting. With divideing you need to think of the numbers as numbers whole numbers than you move the decimals two times because there are two numbers in front of the decimals. And thats why the student is wrong.
This Student Is Correct Because, When You Multiply 4.5 & 1.2 You Have To Line The Numbers As Always.
SHOW YOUR WORK!!
4.5
X 1.2
9.0
45.X
_______
54.0
And This Student Put The Decimal In The Right Place. Because You Misplace Your Decimal Point , Your Answer Could TOTALLY be off!!
-Adrianna
=====
Does it seem reasonable that if I took the decimals off and just multiplied 4 x 1 I get 4 so if I add just a little more to 4 and a little more to 1 I get 54?
This student did all the multiplication right, execpt they didnt put the decimal in the right place it is supposed to be between the 5 and the 4 like this:5.4 because 4.5 and 1.2 is lower than 54 ,so how could they multiply a big number ,also its supposed to 5.4 because there is one decimal between 4.5 so you supposed to move it one before and do it also to 1.2 and if you add both of decimals together they equal two decimals and your supposed move two decimals into 540 and you will get 5.4.
no its not resonabule because you are not alowed to bring th desimal dowen right away. what she should have done was this 4.5*1.2=5.40 is sposto be your answer because when u are mutpling with desimils you are sposto do the desimils last not first. that is why it is not resonabul answer that she got an this problum
I used a sheet of paper to know if the answer is right then I used a couculater and see if the answer is right to
And what did you discover Carmen?
she did the answer wrong
becasue she was suppose to move the decimal to right two times
and she only move the decimal to the right one time
so answer would would be 5.40
She or he did it wrong because he or she did not move the decimal so that why she or he did it wrong because she or he did not follow the Qustion.
Why do they need to move the decimal Consuelo?
She didn’t move the decimal for her answer so she got it wrong because you are two move the decimals two times because of the place they are in so you move it two times
Kelton, What do you mean by “because of the place they are in”?
they are wrong because they did not do the decimal right you dont bring it stright down you count how many spaces there is thank you
What do you mean by “how many spaces there is”?
The solution is incorrect because this person did not move the decimal over 2 spaces so the answer should actually be 5.4
Chase, Why should they move the decimal two spaces?
No I think that answer is wrong because she Brit the decimal down it is supposed to be how many decimals there are I the problem so the answer is 5.4
yes this problem is correct because whenyou multiply with decimals you dont have to carry the decimal all the way thorough the problem just count the numbers through.
Zac, What do you mean by “carry the decimal all the way through” and “just count the number through”?
it is correct because if you multiply 4.5 and 1.2 you will get 54.0
Ally, Does the answer seem reasonable? When I take the decimals off the number and just multiply 4 x 1 I get 4 so if I add a little more to 4 and a little more to 1 is the answer going to be 54???
This student did not do the problem correct. Let me explain this problem. This particular student did line up the problem except for one part , when the student multiplies 4.5 times 1.2 he got the answer of .09. Now i know it may not seem like there is anything wrong but there is: HE FORGOT TO LINE UP .09 WITH 1.2 AND 4.5. Ok I have reasponded to this weeks blog. I enjoy doing these blogs because they have such fun problems to solve. well, this has been fun but im done solving this weeks puzzle. Bye=-) <3
They did a nice try but they forgot to move the decimal over two spaces. The right answer is 5.4
Why do they need to move the decimal over two spaces Brandon?
This problem is incorrect. It is incorrect because when you multiply you have to count how many numbers is behind the decimals in both numbers. You have to add the spaces before the decimals and however many spaces you counted you put the number of spaces behind the decimals in the end number. For example this problem’s answer would be 5.4. So there is a 5 and a 2 after the decimals that means you will count 2 spaces after the decimalin the number so you get 5.4!!!
the solution for this problem is incorrect. all of the work is correct exsept for one thing, were they placed the decimal. the correct answer would be 5.40 because there are two decimals in the problem. so in the solution you would have to skip two places to the left of the answer.to get it correct.
This is incorrect. It has 2 numbers behind a decimal so you have to move the decimal 2 spaces over. 5.4<-.0<-.
2 1
This problem is correct because the decimal points are lined up and the solution is correct
Cole, Do the rules for multiplying decimals say to line up the decimal?
oh I almost forgot, the answer to the problem is .54 not 54.0. this student did NOT line up .09 with 4.5 and 1.2. So there for the answer to the problem is .54
Where does 0.09 come in the problem Emma? Make sure your explanation is very clear so the reader understands your thinking!
the student is correct when you multiply we (ALL) got 54.0 I agree because I got the same answer from the multiplication problem
Oh no! Who does this post belong to?
4.5 multipled by 1.2
i got 5.40 the decimal was in the wrong place that was all
This solution is incorrect because there should be two places the decimal moves. What thisperson did was they lined up the decimals…which is fine in this because they are both double digit numbers. But when they were done with their problem they put 54.0, but the answer should be 5.40 because in the problem itself there is 1 number after each decimal so in your answer you have to move it 2 spaces to the left inseam of just bringing the decimal down!
Instead*
it is incorrect because you need to carry the decimals so it should be 5.4.
What do you mean by “carry the decimals” Kai?
The solution is incorrect because when you MULTIPLY you count the number of places before the decimal and put the decimal that many places, instead of dropping it straight down. For example:
4.5
X3.1
——
45
+ 135
—————–
180 There are 2 places before the decimals.
Therefore, you put a decimal 2 places into the product
180 turns into 1.80 which can be simplified to 1.8
Great job Sydney! I love it when students use similar problems to prove their understanding of a concept! This shows a high level of math thinking!
This solution is incorrect. I know this because this student made the mistake of bringing the decimal place down. Instead this student was supposed to add up the number of decimal places and then move the decimal that many times to the left. You only bring the decimal down in addition and subtraction, not in multiplication.
the student is wrong because when i did the problem i got the same answer but i remembered that you have to count all the spaces to the right of the decimals in 4.5 and in 1.2 and so the answer would not be 54.0 it would be 5.40 so that is how the student went wrong
that is how i solved my answer
Hi miss Ellison so I believe that kid was wrong because my 7th grade teacher alwase told me not to pay attention to decimals when actually doing the math wait until the answer comes out anyway you only bring down the decimal down in + and –
First to tell you personally I can’t do traditional I only can do laddis
Okay 4.5×1.2 the kid was not right becuz I got 300 but any way so how many numbers are behind the decimal
Did you say 2 wow you are right 😉 soo move the decimal 2spaces to the left and you get 3 as an answer lol and guess what………. Maria and I are dating and we need a priest lol wanna volunteer love Turie LOL
Thanks for always giving such a detailed answer Turie. Unfortunately, I am only licensed to be a teacher. You will have to look elsewhere for a priest.
i got 5.40
and also the numbers were lined up wrong and the decimal was in the wrong place
The solution is incorrect. The student put the decimal point in the wrong place. Where the student was when it came to putting the decimal point in its place. When you think about it and take away the numbers behind the dec. point the problem becomes 4 x 1 which equals 4. So know matter how big you make the numbers behind the decimal point for this problem the answer shouldn’t/can’t go into double digits or under 4. So then it would be logical to move the decimal point one space to the left making the solution 5.4
Well done Trey! I like how you related your reasoning to the reasonableness of the answer!!! This shows a higher level of math thinking!
well to be honest the math was correct but the “.” wasnt in the right place because like mrs ellison says caount 1-2 right twards the decmal and place it where it goes! 🙂 😉
Great start Wendy! Why do I say you have to move the decimal when you multiply?
the math is correct but the final answer deimal is not. Correct the final answer is .54
Why is the final answer incorrect? Please provide more explanation Jason!
This is incorrect because you are supposed to move the decimal place over two spaces in this problem because there are two total numbers after the decimal spot which tells you how many spaces you have to move the decimal in your final answer. So the answer should be 4.5*1.2=5.40
This solution is incorrect, the math was right but the student forgot to move the decimal over two times, they only moved it over one (dropped it straight down). Other than that the student did the math right, but not the decimal.
Why did the student need to move the decimal two times Tea?
the answer is correct because the student did line up the decimals and multiply correctly so she did it correct.
Lisbeth, Are the rules for multiplying and adding decimals the same?
This would not be correct because if you have a multiplacation problem with decimals then you do not drop down your decimal you look how many numbers are after the decimal and that’s how many spots you have to move your decimal to the left so the answer to this problem would be 5.40
The answer is incorrect, because the decimal should have been moved 2 times to the left
Good start Eliano! Why should the decimal be moved 2 times to the left?
This answer is incorrect. But the work is correct. The only reason the answer is incorrect is because the decimal is in the wrong spot which makes the answer incorrect. The answer should be 5.4 not 54.0 there’s a big difference.
Why should the decimal be between the 5 and 5 and not the 4 and 0?
It should be between the 5 and the 4 because you only have to move two spaces and not just bring the decimal straight down. Its two spaces because you have to move the decimals to make it a whole number and count the number of spaces while moving the decimal to the right.
For example:
4.3 here you move only one space to make a whole number 43
x 2.3 and here you only move one place to get a whole number 23
——–
43
x23
——–
129
+860
——–
9.89
I moved one space with each number to get a whole number so 1+1=2 so I move two spaces to the left.
The solution is incorrect because when you multiplying decimals you move the decimal over how many spaces are after the decimal. you move the decimal over on the solution. Example 4.5*1.2 after you add them up and get 540 you look up at the top and 4.5 has one number after the decimal and 1.2 has one number after the decimal. So on the solution you move the decimal over to spots so the answer is 5.40
This problem is not correct.You can not line up the decimals when doing a muliplcation problem.When I multiplyed the equation without lineing the decimals I got 5.40. You cant do this becuase the way to solve this kind of problem is when you get your answer you have to move the decimal by using the numbers in the equation and adding how many decimal spaces there are in each problem then add them together.
Ex:
4.5
*1.2
——–
9 0
4 5 0
———
5.4 0
There are two problems in the equation. The first being you dont worry about decimals UNTIL THE END. The second and bigger problem, the decimal went STRAIGHT DOWN. You need to count the places behind the decimals, add up said decimals, the answer you get is the spaces needed in your answer. In this problem, there would be 2 decimal places in the answer.
It is incorrect because he/she dropped the decimal point down with his answer. When you multiply decimals your suppose to look at your to numbers and see how many places it is moved to the right.You only line up your decimals and drop them down when add and subtract decimals.He/She still got the numbers right but not the decimal point in the right place.
This solution is incorrect . For starters when multiplying decimals its not the same as adding and subtracting decimals. In adding and subtracting decimals you can just take the decimal straight down which is what this student did wrong in this problem. So since you cant do that in multiplying decimals the solution is incorrect. The correct way of solving this problem is to just solve the problem as if it was a normal problem and it equals 540. The next step is to count how many numbers are behind the decimals and that is two numbers. So the correct answer is actually 5.40
this solution is incorrect.
the answer is correct but the decimal spot isn’t , its not in the correct spot. you need to move the decimal from both numbers away from the middle so that it is a whole number so move the decimal from 4.5 to the right so know it is 45.0 do the same thing with 1.2 so know it is 12.0 so in total it took me two spaces to move the decimal from both numbers to make it a whole number so know make a decimal at the end of your answer witch is 540 so know it is 540. so since it took me two spaces to make both a whole number know i have to move the decimal from 540. to the right two times so it is know it is 5.4 so that is why the answer is incorrect
I love it when students show a different way of thinking about a problem! Great job Jeanette!
The solution is incorrect.It is incorrect because the student had to move the decimal two spaces not bring it down.The math is right the decimal is just in the wrong spot.The right answer is 5.40.
Why did the student need to move the decimal point to the left Alexis?
The answer is incorrect.The right answer is 5.4. I think the student got mixed up with addition and multiplication because they did everything they were supposed to do except moving the decimal. All they did was dropped the decimal point down and not moved it as many spots to the left.
How are the rules different Hailey? What do you mean by “moved it as many spots to the left”?
NO this is wrong because this student just brought the decimal strait down and forgot that when you are working with 2 or more decimals that you have to move the decimal the same amount of decimals that u are working with in ur problem that saying the answer should have been 5.40
This solution is incorrect. All of the work is correct, the stundent just forgot to move her decimal place the correct number of times. When multiplying decimals, you have to count how many decimal places you have and move your decimal the many times, instead of just dropping the decimal point down like this student did.
The solution of this problem is incorrect because you have to add the decimals of each numbers in your answer. For example:2.1 x 5.1=10.71 because you just do the math and when you have your product you add 2 spaces for the decimal to be so the answer is 10.71. (1071 5.1 one decimal space 2.1 one decimal space 1+1=2 decimal spaces in product 10.71)
Way to go Walter! I love how you used a similar problem to prove that you really understood what was wrong with the original problem! That’s a sign of high level math thinking!
This solution is incorrect because when you multiply decimals the decimal moves how many numbers that are behind the decimals and how many times you moved the decimal that’s we’re it goes in your answer so the answer is 5.40.
The solution is incorrect because the decimals were not moved over 2 times. The answer is 5.40 because the decimal has to move 2 place values.
Why should the decimals be moved two spaces Josias?
the answer to the problem is 54.0 but the student’s computation is incorrect. When multiplying a decimal you never line up decimals. First you line up the numbers multiply like normal. To add the decimal you count over the spaces in the problem and also in the answer.
Example: In the problem 15.2 times 1 15.2 has one space and 1 has zero spaces so in the answer I will count over one space. 152 will turn into 15.2
Great job Citlally! I love how you used a similar problem to show you understood the concept! That is an advanced math skill!!!
In my opinión i think that the answer is correct, because they lined up the decimals, then multiplied five and two and got ten then she carried the one, put it over the four then multiplied two and four added the one, got nine, next she/he multiplied one and five, and carried the five down, and multiplied the four and the one. What she/he got when she was multipling, that person added 90+ 450 and got 540, then she/he put the decimal 1 space to the left and got 54.0
Brian, Are the rules for adding decimals and multiplying decimals the same?
The problem done by the student is incorrect because even though they brought the decimal strait down the need to count the total number of numbers behind the decimal 4.5 and 1.2 there’re is a total of two numbers behind the decimal in both numbers which would make the answer have two numbers after the decimal instead of one so the answer would be 5.40 instead of 54.0 that is why the students problem is incorrect.
This answer is wrong because when you multiply decimal problems, you do not line up your decimals. You multiply your problem as if it were a problem with no decimals. When you are done multiplying your numbers together, you count how many numbers are to the right of the decimal (or behind) for each of your numbers. Once you have done that, on your answer you count how many spaces your answer needs and you place your decimal. So, in this case your answer would be 5.40.
this solution is wrong because there is two decimals and they only moved it once
Rogelio, Why should there be 2 decimal places?
The student was incorrect because when you are multiplying decimals when you find the answer you always count how many numbers after the decimal places to the right then you count over from the last number in the answer and count over how ever many numbers are away from the decimal!!! For example lets say the problem was 5.12 times 3.11 and the answer is 159232 there are four numbers total after the decimal in both problems so you would move over four spaces to the left and place the decimal so the answer would be 15.9232 . The answer to the problem the student solved should actually 5.4. I worked with Malea Ledesma on this blog. I’m just saying that so it doesn’t seem like we are copying each other. Thank you!!!!
The student was incorrect because when you are multiplying decimals you find the answer and you always count how many numbers are after the decimal places to the right then you count over from the last number in the answer and count over. how ever many numbers are away from the decimal. For example lets say the problem was 5.12 times 3.11 and the answer is 159232 there are four numbers total after the decimal in both problems so you would move over four spaces to the left and place the decimal so the answer would be 15.9232 .The answer to the problem the student solved should actually be 5.4. I worked with Angel Ibarra on this blog. Sorry i repeated this again angel already told you.
Great Job Angel and Malea! I love how you used a similar example to prove your reasoning was correct! Well done!
this solution is incorrect because when you are multiplying decimals you count how many numbers are behind each decimal in each number provided so the correct solution would be 5.40 .
The solution is incorrect. Since the numbers were two digit numbers, then the decimal points were lined up, but when you multiply decimals, you don’t need to line up the decimal points. The student did do all the multiplying right, so he had the right numbers. When you multiply decimals though, you multiply like you normally would, then, when you get the answer, you count how many places the decimal points are to the left. That is how many places you move the decimal over in your answer. That means that since there were two places to the left of the decimal points, the answer should have been 5.40.
——————————————————————–
To check your answer, you would round the decimals to the nearest whole number. Then the problem would be 5 times 1 which is equal to 5. The product 54.0 would not make sense, but the product 5.40 would because 5 is close to 5.40.
The solution is incorrect. The properties for multiplying decimals is not the same as for adding decimals.
Adding decimals: Multiplying Decimals:
4.5 4.5
+1.2 *1.2
= =
5.7 0.045
Can you explain each method separately Ben? It is hard to understand what is going on in your examples when they are grouped so close together.
He was incorrect by the decimal being in the incorrect place
He did not understand how he moved the decimals 2 spaces left to get 5.40.
My example: 4.5
x1.2
———
90
+450
———-
5.40
Daniel, Why should he move the decimal 2 spaces?
The student did it wrong because you do not bring the decimal straight down you move it depending on how many numbers are behind the decimal. The actual answer would be 5.4
The solution is incorrect because when I multiple I did the exact same thing. But after I got 540 I needed to move the decimals 2 places to the left because there is decimals place in the factors. So I well move it 2 places to the product and my answer is 5.4.
Kaeden, How does the decimal point in the factors affect the decimal point in the answer?
This answer is incorrect because 4.5 times 1.2 is 5.4. This student did the multiplication wrong and placed the decimal point in the wrong place.
How did the student place the decimal in the wrong place? Can you explain Cristian?
I think this answer is correct because when I multiplied the number decimals given I got the same answer and the decimal does belong in the correct area. 😁
Hazel, If I took the decimals away and just multiplied 4*1 I get 4. So if I add just a little more to 4 and a little more to 1, does 54 seem like a reasonable answer?
It is rong because they dropped the decaiml in the second have of the problem and the answer should be 5.4.
Why should the answer be 5.4? Why is it wrong?
The answer is incorrect because you don’t bring down the decimal point when multiplying. You count how many numbers are behind the decimal points. So 4.5 x 1.2 = 5.40 because there are two numbers behind the decimal point.
the answer is incorrect because you don’t bring down the decimal your suppose to count how many number are behind the decimal
Oh no! Who does this post belong to?
it is wrong because the decimal point isnt moved to the left
Thanks Jaydin! Can you clarify what you mean by the decimal point isn’t moved to the left?
This solution is incorrect because in multiplying decimals you dont line up the decimals.To add the decimals you count over the spaces in the problem
Every thing is right but the decimal point. The way you did it was like adding. You brought the decimal straight down. Really your suppose to count how many decimals places there are. It’s 5.4.
this is incorrect because you multiply regularly and than you add in the the decimal by how much spaces that are in between the numbers.
The correct answer is 5.40 because you were supposed to add in two decimal places instead of one.
by the way this is late
your answer is wrong your supposed to ignore the decimal points until you have multiplied and added everything together then you count how any points there are and however many there are you count hover many numbers in this case it would be two decimal points my final product was 5.40 n0t 54.0
Teresa Magdaleno 2nd. Period 10/23/14
The answer to the problem is incorrect because they put the decimal in the wrong spot it is supposed to be between the 5 and the 4
Can you explain how you know this Teresa?
your answer is wrong because there are two decimals so you have to move the decimal to places in the answer so the correct answer is 5.4.
The answer the student gave is incorrect. What the student did wrong was he brought the decimal straight down instead of brining it over two times to the left. The answer to this problem is 5.4.
the students answer is incorrect because when you multiply decimals you do not have to line up the decimals because its just multiplying the numbers then you count how many numbers are to the right of the decimal then put the decimal how ever many numbers you got from the answer.
The answer is incorrect because in stead of being 4.5 ×1.2= 90 its supposed to be 50. And that changes your answer so your answer is 50.0.
This answer is incorrect because 4.5 x 1.2 = 90+450 = 5.40…. my reason is that there is 2 decimals… and the amount of decimals get plugged in like: 540. = 1 dec, 54.0 = 2 dec, 5.40 … so the correct way would be : 4.5
x 1.2
———–
90
+450
————
5.40
the student is incorrect because when you multiply decimals you don’t just bring is right down you count how many spaces are after the decimal then you count those spaces in your answer then put the decimal.
I think it is incorrect because 4.5 times1.2 is 540. All that he forgot to do is carry the decimal to the right 2 times, because there is 2 decimals. So u move it to the right 2 times so the answer would be 540
The person who did the problem made a mistake. THEY DID NOT
MOVE THE DECIMAL! The decimal moves by how many decimals
places there are in the problem in TOTAL!_THANK YOU!!!!
This student did his work wrong because he put the decimal in the wrong place. The decimal is in the wrong place because he just followed it straight down . Just my putting the decimal in the wrong place your whole question is going to get mixed up and its not going to make sense. Be careful.
IT’S NCORRECT because they didn’t multiply the decimal and it’s in the wrong place
This student did this solution wrong because this student put the decimal in the wrong place.the student put the decimal straight down .you also need to be careful where you put your decimal.
the solution is incorrect. The student put the decimal point in tbe wrong place. where the studebt was when it came to puttinv tbe decimal point in its place. when you think about it and take away the numbers behind the decimal point the problem becomes 4 x 1 which eqequals 4. so no matter how big you made the numbers behind the decimal point. so then it would be logical to move the decimal points 1 space to the left making the solution 5.4.
it incorrect because they didn’t multiply with the decimal correctly and its in the wrong place.