The first step you must do in adding decimals is line the numbers up like in the photo below.
The second step you must do is add together the hundredths place then the tenths place and then the ones place.
Here are two examples:
1. Joey's teacher gave him two decimals and told him to add them together. his numbers were 2.45 + 6.03, the answer he got was
2.45 + 6.03= 8.48.
2. Linda and Karen had two decimals they wondered what would the answer would be it they added them together. There numbers were 5.32+4.57, and there answer was 5.32+4.57=9.89