Subtract 7/63 from 7/81
7/81 - 7/63 is -2/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 63 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
7/81 = 7 × 7/81 × 7 = 49/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
7/63 = 7 × 9/63 × 9 = 63/567 - Subtract the two like fractions:
49/567 - 63/567 = 49 - 63/567 = -14/567 - After reducing the fraction, the answer is -2/81
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