Yes, unless you are an expert.
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First you write the decimals one under the other, in such as way that the decimal points are aligned.
This is effectively the same as lining up the decimal points when adding or subtracting ordinary decimal fractions.
It's a good idea.
Write the numbers in a column so that all the decimal points are one below the other. Put a decimal point in the answers underneath the coumn of decimal points. Then add the numbers ignoring the decimal points.
The simplest way is to line up the numbers so that their decimal points are aligned, and corresponding digits are also aligned according to their place value.