Adding and Subtracting Decimals
Adding and subtracting decimals is easy if you're comfortable with carrying and borrowing. Just line up the decimal points, and (if necessary) add zeros to the end of one number, so they have the same number of decimal places. Then add (or subtract) as you usually would.
In your answer, the decimal point should go exactly below where it is in the numbers being added (or subtracted).
Example 1:
Add 13.492 and 7.8.
Write two extra zeros at the end of 7.8, and write the numbers vertically.
Now add.
The answer is 21.292.
Example 2:
Subtract 7.8 from 13.492.
Write two extra zeros at the end of 7.8, and write the numbers vertically.
Now subtract.
The answer is 5.692.
