Subtract 56/7 from 15/30, Solve 15/30

Subtract 56/7 from 15/30

1^st number: 15/30, 2^nd number: 8 0/7

15/30 - 56/7 is -15/2.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210
Likewise, for the 2nd fraction, since 7 × 30 = 210,
56/7 = 56 × 30/7 × 30 = 1680/210
Subtract the two like fractions:
105/210 - 1680/210 = 105 - 1680/210 = -1575/210
After reducing the fraction, the answer is -15/2

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