Subtract 9/7 from 42/81
1st number: 42/81, 2nd number: 1 2/7
42/81 - 9/7 is -145/189.
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,
42/81 = 42 × 7/81 × 7 = 294/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
9/7 = 9 × 81/7 × 81 = 729/567 - Subtract the two like fractions:
294/567 - 729/567 = 294 - 729/567 = -435/567 - After reducing the fraction, the answer is -145/189
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