Subtract 21/81 from 8/7
1st number: 1 1/7, 2nd number: 21/81
8/7 - 21/81 is 167/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
8/7 = 8 × 81/7 × 81 = 648/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Subtract the two like fractions:
648/567 - 147/567 = 648 - 147/567 = 501/567 - After reducing the fraction, the answer is 167/189
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