You have to convert one of them to the other, and then add as usual.
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you multiple it first then you add it after that you got the answer
It isn't clear what you want to calculate. Add fractions? Multiply them? Convert fraction to decimal? Decimal to fraction? The details of the calculations, of course, vary depending on what you want to calculate.
To the left of a decimal point are whole numbers. On the right of a decimal point are parts of a whole number.
a decimeter is a decimal then add a fraction for example 0.5 + 1-2 =0.8
0.4 as a fraction and decimal