Subtract 15/12 from 56/21, Solve 2 14/21

Subtract 15/12 from 56/21

1^st number: 2 14/21, 2^nd number: 1 3/12

56/21 - 15/12 is 17/12.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 21 × 4 = 84,
56/21 = 56 × 4/21 × 4 = 224/84
Likewise, for the 2nd fraction, since 12 × 7 = 84,
15/12 = 15 × 7/12 × 7 = 105/84
Subtract the two like fractions:
224/84 - 105/84 = 224 - 105/84 = 119/84
After reducing the fraction, the answer is 17/12
In mixed form: 15/12

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