Subtract 21/80 from 10/9
1st number: 1 1/9, 2nd number: 21/80
10/9 - 21/80 is 611/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 9 × 80 = 720,
10/9 = 10 × 80/9 × 80 = 800/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Subtract the two like fractions:
800/720 - 189/720 = 800 - 189/720 = 611/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/9-21/80 10/9-42/80 10/18-21/80 30/9-21/80 10/9-63/80 10/27-21/80 50/9-21/80 10/45-21/80 70/9-21/80 10/63-21/80