Subtract 21/80 from 18/5
1st number: 3 3/5, 2nd number: 21/80
18/5 - 21/80 is 267/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 5 × 16 = 80,
18/5 = 18 × 16/5 × 16 = 288/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Subtract the two like fractions:
288/80 - 21/80 = 288 - 21/80 = 267/80 - In mixed form: 327/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5-21/80 18/5-42/80 18/10-21/80 54/5-21/80 18/5-63/80 18/15-21/80 90/5-21/80 18/25-21/80 18/35-21/80