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Q: Why do we have to line up the decimal points when we subtract 1.7-85?

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

Line up the decimal points and then subtract one from the other.

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

To subtract 0.5 from 0.05 first line up the decimal points in your equation. If you need to add a zero behind the 5 in 0.5 so you get 0.50. Then subtract as if there was no decimal point (take it as 50-5). After you subtract bring the decimal point down. You should end up with 0.45.

500.9

It's 0.01 Line up the decimal points and subtract: 1.00 0.99 - -------- 0.01

-to add or subtract decimals, line up the decimal points -add or subtract the same way you do with whole numbers ex: 12.4 +8.1 ______ 20.5 You can also do this strategy: 2.0 +6.0 _____ 8.0

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

To ensure that you correctly add or subtract the correct place value from each other.

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.

It is not a matter of aligning the decimal points, but aligning the place value columns so that the ones are under each other, the tens are under each other, the tenths are under each other, etc which is the proper way to subtract. As the decimal points are between the ones and tenths columns, with those place value columns aligned, the decimal points are aligned.Aligning the decimal points is an easy way to remember to align the place value columns, as with the decimal points aligned all the place value columns are automatically aligned.

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