You can do reverse operation to check. If you checked it and it is not the answer you got, try the problem and recheck it to see if your right.
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Yes
add them or subtract them, as appropriate!
Adding decimal same as adding whole numbers
They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
First you write the decimals one under the other, in such as way that the decimal points are aligned.