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
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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.
Adding decimal same as adding whole numbers
Yes.
First you write the decimals one under the other, in such as way that the decimal points are aligned.
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.