The answer is 0.4
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821/40 = 8.525
It is: 8.525
8 21/40 = 8.525
Divide 21 / 40 on a calculator. Then add the result to 8.If you have a scientific calculator (one that correctly does multiplications and divisions before it does additions and subtractions), you can type directly:8 + 12 / 40
2.625