Subtract 21/8 from 80/7
1st number: 11 3/7, 2nd number: 2 5/8
80/7 - 21/8 is 493/56.
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,
80/7 = 80 × 8/7 × 8 = 640/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
21/8 = 21 × 7/8 × 7 = 147/56 - Subtract the two like fractions:
640/56 - 147/56 = 640 - 147/56 = 493/56 - In mixed form: 845/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/7-42/8 80/14-21/8 80/7-21/16 80/7-63/8 80/21-21/8 80/7-21/24 80/35-21/8 80/7-21/40 80/49-21/8 80/7-21/56