Subtract 20/7 from 1/81
1st number: 1/81, 2nd number: 2 6/7
1/81 - 20/7 is -1613/567.
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,
1/81 = 1 × 7/81 × 7 = 7/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
20/7 = 20 × 81/7 × 81 = 1620/567 - Subtract the two like fractions:
7/567 - 1620/567 = 7 - 1620/567 = -1613/567
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