Answer:
in order to find the answer, when adding decimals, you must count the numbers before the decimal points. Then, remove the decimal point and proceed as you would would adding whole numbers. Once finished, start from the side that has the first number and count up to the amount of numbers you counted before. Then, place the decimal point and simplify if needed.
Explanation:
don't know if you want to answer in these exact words but it's a start by making sure you are familiar with the concept