Subtract 49/5 from 80/21
1st number: 3 17/21, 2nd number: 9 4/5
80/21 - 49/5 is -629/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
80/21 = 80 × 5/21 × 5 = 400/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
49/5 = 49 × 21/5 × 21 = 1029/105 - Subtract the two like fractions:
400/105 - 1029/105 = 400 - 1029/105 = -629/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-98/5 80/42-49/5 80/21-49/10 80/63-49/5 80/21-49/15 80/21-49/25 80/21-49/35