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

Q: When adding or subtracting decimals always do what?

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Yes

school you can always get help from teachers, parents or people who think might know

add them or subtract them, as appropriate!

Adding decimal same as adding whole numbers

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

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Yes

school you can always get help from teachers, parents or people who think might know

adding subtracting multiplying and dividing

add them or subtract them, as appropriate!

Adding decimal same as adding whole numbers

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

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.

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.

Mostly geometry, adding, subtracting fractions and decimals.

Yes.

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