Subtract 80/9 from 21/20
1st number: 1 1/20, 2nd number: 8 8/9
21/20 - 80/9 is -1411/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
80/9 = 80 × 20/9 × 20 = 1600/180 - Subtract the two like fractions:
189/180 - 1600/180 = 189 - 1600/180 = -1411/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-80/9 21/40-80/9 21/20-80/18 63/20-80/9 21/60-80/9 21/20-80/27 21/20-80/45 21/20-80/63