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you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...

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

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

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.

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

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

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

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

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

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

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)

Because the number in decimal form has a different value based on their position from the decimal point. Every one number left of decimal point it will be valued 10 times. If you don't line them up you can compare them because they might have a different value and you will end up messing your calculation.

To add decimal numbers you line up the decimal points... _0.88 +0.035 --------- _0.915

line up the decimal points, and add them

you have to line up the decimal points because you need to keep each place value in the same column so when you add or subtract you wont make any errors

Line up the numbers in such a way that the decimal points are aligned. . Example: 567.89 - 23.4 567.89 - 23.4 ===== 544.49

Because the number of digits after the decimal place in a product does not require that.

Line them up, one below the other, with the decimal points in the same column. Ordering them is then straightforward.

Line up the decimal points in a vertical column. Then add the numbers while ignoring the decimal point. Finally, put a decimal point in the answer in the same column as for the summands.

The line over a repeating decimal is called the vinculum.

It is irrelevant if multiplying or dividing decimal numbers. For addition and subtraction it is not sufficient: you need to line up the decimal points as well as the digits according to their place values. If you intend to simply align the decimal points then you may as well not bother. This is to ensure that addition or subtraction is carried out for digits with the same place value.

It is important for you to line up the decimals vertically the way I did above so that you can keep track of the place-value position of the digits.

You line up the decimal points and subtract, and carry the decimal point down to the same position in your answer: 1.3

You line up the decimals with the thousandths and put the decimal straight down from where it is and just add with the decimal in the same spot.

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