Subtract 42/15 from 7/63, Solve 7/63

Subtract 42/15 from 7/63

1^st number: 7/63, 2^nd number: 2 12/15

7/63 - 42/15 is -121/45.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 63 × 5 = 315,
7/63 = 7 × 5/63 × 5 = 35/315
Likewise, for the 2nd fraction, since 15 × 21 = 315,
42/15 = 42 × 21/15 × 21 = 882/315
Subtract the two like fractions:
35/315 - 882/315 = 35 - 882/315 = -847/315
After reducing the fraction, the answer is -121/45

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