Subtract 12/16 from 1/21, Solve 1/21

Subtract 12/16 from 1/21

1/21 - 12/16 is -59/84.

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,
1/21 = 1 × 16/21 × 16 = 16/336
Likewise, for the 2nd fraction, since 16 × 21 = 336,
12/16 = 12 × 21/16 × 21 = 252/336
Subtract the two like fractions:
16/336 - 252/336 = 16 - 252/336 = -236/336
After reducing the fraction, the answer is -59/84

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