Subtract 42/49 from 20/54
20/54 - 42/49 is -92/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 49 is 2646
Next, find the equivalent fraction of both fractional numbers with denominator 2646 - For the 1st fraction, since 54 × 49 = 2646,
20/54 = 20 × 49/54 × 49 = 980/2646 - Likewise, for the 2nd fraction, since 49 × 54 = 2646,
42/49 = 42 × 54/49 × 54 = 2268/2646 - Subtract the two like fractions:
980/2646 - 2268/2646 = 980 - 2268/2646 = -1288/2646 - After reducing the fraction, the answer is -92/189
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