Subtract 1/21 from 27/28
27/28 - 1/21 is 11/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
27/28 = 27 × 3/28 × 3 = 81/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Subtract the two like fractions:
81/84 - 4/84 = 81 - 4/84 = 77/84 - After reducing the fraction, the answer is 11/12
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