Before you add or subtract decimals, what must you do?
1 answer
Before you add or subtract decimals, you must make sure that the decimal points are lined up correctly. This means that the decimal points in each number should be directly above each other. If necessary, you may also need to add zeros to the end of the numbers to ensure that they have the same number of decimal places. Once the numbers are lined up correctly, you can proceed with the addition or subtraction.