Subtract 72/8 from 12/7
1st number: 1 5/7, 2nd number: 9 0/8
12/7 - 72/8 is -51/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
12/7 = 12 × 8/7 × 8 = 96/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
72/8 = 72 × 7/8 × 7 = 504/56 - Subtract the two like fractions:
96/56 - 504/56 = 96 - 504/56 = -408/56 - After reducing the fraction, the answer is -51/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7-72/8 12/14-72/8 12/7-72/16 36/7-72/8 12/21-72/8 12/7-72/24 60/7-72/8 12/35-72/8 12/7-72/40 84/7-72/8 12/49-72/8 12/7-72/56