Subtract 40/56 from 1/21
1/21 - 40/56 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
40/56 = 40 × 3/56 × 3 = 120/168 - Subtract the two like fractions:
8/168 - 120/168 = 8 - 120/168 = -112/168 - After reducing the fraction, the answer is -2/3
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