Subtract 4/7 from 80/21
1st number: 3 17/21, 2nd number: 4/7
80/21 - 4/7 is 68/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
80/21 = 80 × 1/21 × 1 = 80/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
4/7 = 4 × 3/7 × 3 = 12/21 - Subtract the two like fractions:
80/21 - 12/21 = 80 - 12/21 = 68/21 - In mixed form: 35/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-8/7 80/42-4/7 80/21-4/14 80/21-12/7 80/63-4/7 80/21-4/21 80/21-20/7 80/21-4/35 80/21-28/7 80/21-4/49