Subtract 21/20 from 6/9
1st number: 6/9, 2nd number: 1 1/20
6/9 - 21/20 is -23/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
6/9 = 6 × 20/9 × 20 = 120/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Subtract the two like fractions:
120/180 - 189/180 = 120 - 189/180 = -69/180 - After reducing the fraction, the answer is -23/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/9-21/20 6/9-42/20 6/18-21/20 6/9-21/40 18/9-21/20 6/9-63/20 6/27-21/20 6/9-21/60 30/9-21/20 6/45-21/20 42/9-21/20 6/63-21/20