Subtract 42/49 from 10/21
10/21 - 42/49 is -8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
10/21 = 10 × 7/21 × 7 = 70/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
42/49 = 42 × 3/49 × 3 = 126/147 - Subtract the two like fractions:
70/147 - 126/147 = 70 - 126/147 = -56/147 - After reducing the fraction, the answer is -8/21
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