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Q: When adding and subtracting decimals you must?

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Yes.

3rd. Adding Decimals 5th - Adding and subtracting 6th - Dividing Decimals

Yes

adding subtracting multiplying and dividing

Adding decimal same as adding whole numbers

They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.

First you write the decimals one under the other, in such as way that the decimal points are aligned.

Mostly geometry, adding, subtracting fractions and decimals.

When adding and/or subtracting, your answer can only show as many decimal places as the measurement having the fewest number in the decimal places.

I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.

When you are adding and subtracting decimals, youare +/- ing the whole numbers and tenths in the number. the decimal might go away ex: 1.3-0.3=1 or it won't ex: 1.9-0.3=1.6

Yes, unless you are an expert.

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