Subtract 40/3 from 81/42
1st number: 1 39/42, 2nd number: 13 1/3
81/42 - 40/3 is -479/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 3 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
81/42 = 81 × 1/42 × 1 = 81/42 - Likewise, for the 2nd fraction, since 3 × 14 = 42,
40/3 = 40 × 14/3 × 14 = 560/42 - Subtract the two like fractions:
81/42 - 560/42 = 81 - 560/42 = -479/42
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