Subtract 15/16 from 7/21, Solve 7/21

Subtract 15/16 from 7/21

7/21 - 15/16 is -29/48.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 21 × 16 = 336,
7/21 = 7 × 16/21 × 16 = 112/336
Likewise, for the 2nd fraction, since 16 × 21 = 336,
15/16 = 15 × 21/16 × 21 = 315/336
Subtract the two like fractions:
112/336 - 315/336 = 112 - 315/336 = -203/336
After reducing the fraction, the answer is -29/48

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