Subtract 21/81 from 10/63
10/63 - 21/81 is -19/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 63 × 9 = 567,
10/63 = 10 × 9/63 × 9 = 90/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Subtract the two like fractions:
90/567 - 147/567 = 90 - 147/567 = -57/567 - After reducing the fraction, the answer is -19/189
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