Subtract 3/6 from 80/21
1st number: 3 17/21, 2nd number: 3/6
80/21 - 3/6 is 139/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
80/21 = 80 × 2/21 × 2 = 160/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
3/6 = 3 × 7/6 × 7 = 21/42 - Subtract the two like fractions:
160/42 - 21/42 = 160 - 21/42 = 139/42 - In mixed form: 313/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42-3/6 80/21-3/12 80/21-9/6 80/63-3/6 80/21-3/18 80/21-15/6 80/21-3/30 80/21-21/6 80/21-3/42