Subtract 21/18 from 80/9
1st number: 8 8/9, 2nd number: 1 3/18
80/9 - 21/18 is 139/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 9 × 2 = 18,
80/9 = 80 × 2/9 × 2 = 160/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
21/18 = 21 × 1/18 × 1 = 21/18 - Subtract the two like fractions:
160/18 - 21/18 = 160 - 21/18 = 139/18 - In mixed form: 713/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-42/18 80/18-21/18 80/9-21/36 80/9-63/18 80/27-21/18 80/9-21/54 80/45-21/18 80/9-21/90 80/63-21/18