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Q: When do you line up the decimal?

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in a multiplication problem, you don't have to. in addition & subtraction, you do

Line up the decimal numbers like this, 100.5 + 9.0 then add normally and put in the decimal right below the decimal obove.^

No it is more. If you line them up then compare for the biggest number from left to right it is obvious. (Line them up from the decimal)

If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7

Either, the decimal with a line over what's repeating (eg. 0.6 with a line over it), or decimal repeating (eg. "point six repeating").

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Because if you don't line them up you will get a total different answer.

That is because if you don't, you will get the wrong answer. It is ALWAYS important to LINE up the decimals.

Unlike addition, there is no need to line up the decimal points. Just multiply ignoring the decimal points. When you are done, move the decimal point of the result to the left equal to the number of digits after the decimal point for both multiplicands.

line up the numbers and decimals multiply regularly then bring the decimal down

explain why it is important to line up decimal numbers by their place value when you add or subtract them

86.7

in a multiplication problem, you don't have to. in addition & subtraction, you do

Line up the decimal numbers like this, 100.5 + 9.0 then add normally and put in the decimal right below the decimal obove.^

It is easier to add up numbers. It may also be easier to spot errors where the decimal point is misplaced.

We line up the decimal numbers so as to get accurate results. Example: 0.2 + 7.31 + 1.054 * It is easier to add this vertically. 0.2 7.31 1.054 ==== 8.564

You have to line up the decimal when adding but not when multiplying. Example: This one is adding 23.56+89.45 23.56 89.45 This one is multiplying 23.54*4.506 23.54 4.506

line up the decimal points, and add them

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