Subtract 21/80 from 7/2
1st number: 3 1/2, 2nd number: 21/80
7/2 - 21/80 is 259/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 2 × 40 = 80,
7/2 = 7 × 40/2 × 40 = 280/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Subtract the two like fractions:
280/80 - 21/80 = 280 - 21/80 = 259/80 - In mixed form: 319/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2-21/80 7/2-42/80 7/4-21/80 21/2-21/80 7/2-63/80 7/6-21/80 35/2-21/80 7/10-21/80 49/2-21/80 7/14-21/80