Subtract 21/80 from 45/7
1st number: 6 3/7, 2nd number: 21/80
45/7 - 21/80 is 3453/560.
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,
45/7 = 45 × 80/7 × 80 = 3600/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Subtract the two like fractions:
3600/560 - 147/560 = 3600 - 147/560 = 3453/560 - In mixed form: 693/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-21/80 45/7-42/80 45/14-21/80 45/7-63/80 45/21-21/80 45/35-21/80 45/49-21/80