Subtract 90/7 from 72/84
1st number: 72/84, 2nd number: 12 6/7
72/84 - 90/7 is -12/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
72/84 = 72 × 1/84 × 1 = 72/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
90/7 = 90 × 12/7 × 12 = 1080/84 - Subtract the two like fractions:
72/84 - 1080/84 = 72 - 1080/84 = -1008/84 - After reducing the fraction, the answer is -12/1
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