Subtract 21/8 from 9/63, Solve 9/63

Subtract 21/8 from 9/63

1^st number: 9/63, 2^nd number: 2 5/8

9/63 - 21/8 is -139/56.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 8 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 63 × 8 = 504,
9/63 = 9 × 8/63 × 8 = 72/504
Likewise, for the 2nd fraction, since 8 × 63 = 504,
21/8 = 21 × 63/8 × 63 = 1323/504
Subtract the two like fractions:
72/504 - 1323/504 = 72 - 1323/504 = -1251/504
After reducing the fraction, the answer is -139/56

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