Subtract 7/21 from 42/36, Solve 1 6/36

Subtract 7/21 from 42/36

1^st number: 1 6/36, 2^nd number: 7/21

42/36 - 7/21 is 5/6.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 36 × 7 = 252,
42/36 = 42 × 7/36 × 7 = 294/252
Likewise, for the 2nd fraction, since 21 × 12 = 252,
7/21 = 7 × 12/21 × 12 = 84/252
Subtract the two like fractions:
294/252 - 84/252 = 294 - 84/252 = 210/252
After reducing the fraction, the answer is 5/6

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