Subtract 21/80 from 12/7
1st number: 1 5/7, 2nd number: 21/80
12/7 - 21/80 is 813/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 7 × 80 = 560,
12/7 = 12 × 80/7 × 80 = 960/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Subtract the two like fractions:
960/560 - 147/560 = 960 - 147/560 = 813/560 - In mixed form: 1253/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7-21/80 12/7-42/80 12/14-21/80 36/7-21/80 12/7-63/80 12/21-21/80 60/7-21/80 12/35-21/80 84/7-21/80 12/49-21/80