To add decimals, line up the decimal points so that place-value positions correspond.
3.75
Practice makes perfect
Before we find the exact sum, we can make an estimate by rounding each addend. We will round 1.5 to 2 and 2.25 to 2 because they are the closest whole numbers.
2+2=4The sum of 1.5 and 2.25 is about 4. Now we can find the exact sum. To add decimals, we line up the decimal points so that place-value positions correspond. Annex a zero so that each place has a digit.
Now we add the decimals, just as we would with whole numbers, and place the decimal point in the answer.
