Subtract 90/27 from 20/7
1st number: 2 6/7, 2nd number: 3 9/27
20/7 - 90/27 is -10/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 7 × 27 = 189,
20/7 = 20 × 27/7 × 27 = 540/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
90/27 = 90 × 7/27 × 7 = 630/189 - Subtract the two like fractions:
540/189 - 630/189 = 540 - 630/189 = -90/189 - After reducing the fraction, the answer is -10/21
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