Subtract 81/7 from 72/80
1st number: 72/80, 2nd number: 11 4/7
72/80 - 81/7 is -747/70.
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,
81/7 = 81 × 80/7 × 80 = 6480/560 - Subtract the two like fractions:
504/560 - 6480/560 = 504 - 6480/560 = -5976/560 - After reducing the fraction, the answer is -747/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80-81/14 72/80-81/21 72/80-81/35 72/80-81/49