Subtract 28/20 from 40/9
1st number: 4 4/9, 2nd number: 1 8/20
40/9 - 28/20 is 137/45.
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,
40/9 = 40 × 20/9 × 20 = 800/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
28/20 = 28 × 9/20 × 9 = 252/180 - Subtract the two like fractions:
800/180 - 252/180 = 800 - 252/180 = 548/180 - After reducing the fraction, the answer is 137/45
- In mixed form: 32/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-28/20 40/9-56/20 40/18-28/20 40/9-28/40 40/9-84/20 40/27-28/20 40/9-28/60 40/45-28/20 40/63-28/20