Subtract 20/36 from 81/42
1st number: 1 39/42, 2nd number: 20/36
81/42 - 20/36 is 173/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 42 × 6 = 252,
81/42 = 81 × 6/42 × 6 = 486/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
20/36 = 20 × 7/36 × 7 = 140/252 - Subtract the two like fractions:
486/252 - 140/252 = 486 - 140/252 = 346/252 - After reducing the fraction, the answer is 173/126
- In mixed form: 147/126
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