Subtract 15/12 from 42/14, Solve 3 0/14

Subtract 15/12 from 42/14

1^st number: 3 0/14, 2^nd number: 1 3/12

42/14 - 15/12 is 7/4.

Find the least common denominator or LCM of the two denominators:
LCM of 14 and 12 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 14 × 6 = 84,
42/14 = 42 × 6/14 × 6 = 252/84
Likewise, for the 2nd fraction, since 12 × 7 = 84,
15/12 = 15 × 7/12 × 7 = 105/84
Subtract the two like fractions:
252/84 - 105/84 = 252 - 105/84 = 147/84
After reducing the fraction, the answer is 7/4
In mixed form: 13/4

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