When you add decimals, you start by lining up the decimal points. Sometimes, you may want to annex a zero to keep things lined up.
Let's try it with First, write the problem with the decimal points lined up. Since 15.6 does not have any digits in the hundredths place, you can annex,
or add, a 0 to the end. You can annex zeros to the end of a decimal without changing the value of the decimal. The decimals 15.6 and 15.60 are or the same. Now, add as you would with whole numbers. Be sure to regroup if needed. Remember to put the decimal point in your answer.
