Subtract 15/7 from 21/42
1st number: 21/42, 2nd number: 2 1/7
21/42 - 15/7 is -23/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
15/7 = 15 × 6/7 × 6 = 90/42 - Subtract the two like fractions:
21/42 - 90/42 = 21 - 90/42 = -69/42 - After reducing the fraction, the answer is -23/14
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