Subtract 21/20 from 28/56
1st number: 28/56, 2nd number: 1 1/20
28/56 - 21/20 is -11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 20 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
28/56 = 28 × 5/56 × 5 = 140/280 - Likewise, for the 2nd fraction, since 20 × 14 = 280,
21/20 = 21 × 14/20 × 14 = 294/280 - Subtract the two like fractions:
140/280 - 294/280 = 140 - 294/280 = -154/280 - After reducing the fraction, the answer is -11/20
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