Subtract 90/7 from 72/80
1st number: 72/80, 2nd number: 12 6/7
72/80 - 90/7 is -837/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
72/80 = 72 × 7/80 × 7 = 504/560 - Likewise, for the 2nd fraction, since 7 × 80 = 560,
90/7 = 90 × 80/7 × 80 = 7200/560 - Subtract the two like fractions:
504/560 - 7200/560 = 504 - 7200/560 = -6696/560 - After reducing the fraction, the answer is -837/70
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