Subtract 40/12 from 81/63
1st number: 1 18/63, 2nd number: 3 4/12
81/63 - 40/12 is -43/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 12 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
81/63 = 81 × 4/63 × 4 = 324/252 - Likewise, for the 2nd fraction, since 12 × 21 = 252,
40/12 = 40 × 21/12 × 21 = 840/252 - Subtract the two like fractions:
324/252 - 840/252 = 324 - 840/252 = -516/252 - After reducing the fraction, the answer is -43/21
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