Subtract 63/21 from 9/16, Solve 9/16

Subtract 63/21 from 9/16

1^st number: 9/16, 2^nd number: 3 0/21

9/16 - 63/21 is -39/16.

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

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 16 × 21 = 336,
9/16 = 9 × 21/16 × 21 = 189/336
Likewise, for the 2nd fraction, since 21 × 16 = 336,
63/21 = 63 × 16/21 × 16 = 1008/336
Subtract the two like fractions:
189/336 - 1008/336 = 189 - 1008/336 = -819/336
After reducing the fraction, the answer is -39/16

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