Subtract 81/40 from 54/84
1st number: 54/84, 2nd number: 2 1/40
54/84 - 81/40 is -387/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
54/84 = 54 × 10/84 × 10 = 540/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
81/40 = 81 × 21/40 × 21 = 1701/840 - Subtract the two like fractions:
540/840 - 1701/840 = 540 - 1701/840 = -1161/840 - After reducing the fraction, the answer is -387/280
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Related: 54/84-81/80