Subtract 21/56 from 4/20
4/20 - 21/56 is -7/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 20 × 14 = 280,
4/20 = 4 × 14/20 × 14 = 56/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Subtract the two like fractions:
56/280 - 105/280 = 56 - 105/280 = -49/280 - After reducing the fraction, the answer is -7/40
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