8.525
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821/40 = 8.525
21/8 = 2.625
Since the prime factors of 21 are 3 x 7 and the prime factors of 8 are 2 x 2 x 2, 21/8 is already in simplest form. However, it may be preferable to express the number in mixed form, two and five eighths, or in decimal form, 2.625.
37 over 8 in decimal form = 4.62537/8:= 37 ÷ 8= 4.625 in decimal
15 over 8 in decimal form = 1.87515/8:= 15 ÷ 8= 1.875 in decimal