Subtract 42/21 from 7/63
1st number: 7/63, 2nd number: 2 0/21
7/63 - 42/21 is -17/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
7/63 = 7 × 1/63 × 1 = 7/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
42/21 = 42 × 3/21 × 3 = 126/63 - Subtract the two like fractions:
7/63 - 126/63 = 7 - 126/63 = -119/63 - After reducing the fraction, the answer is -17/9
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