Subtract 21/7 from 21/81
1st number: 21/81, 2nd number: 3 0/7
21/81 - 21/7 is -74/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
21/7 = 21 × 81/7 × 81 = 1701/567 - Subtract the two like fractions:
147/567 - 1701/567 = 147 - 1701/567 = -1554/567 - After reducing the fraction, the answer is -74/27
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