Subtract 21/9 from 56/81
1st number: 56/81, 2nd number: 2 3/9
56/81 - 21/9 is -133/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 9 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
56/81 = 56 × 1/81 × 1 = 56/81 - Likewise, for the 2nd fraction, since 9 × 9 = 81,
21/9 = 21 × 9/9 × 9 = 189/81 - Subtract the two like fractions:
56/81 - 189/81 = 56 - 189/81 = -133/81
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