Subtract 90/81 from 20/63
1st number: 20/63, 2nd number: 1 9/81
20/63 - 90/81 is -50/63.
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,
20/63 = 20 × 9/63 × 9 = 180/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
90/81 = 90 × 7/81 × 7 = 630/567 - Subtract the two like fractions:
180/567 - 630/567 = 180 - 630/567 = -450/567 - After reducing the fraction, the answer is -50/63
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