Subtract 28/20 from 4/7
1st number: 4/7, 2nd number: 1 8/20
4/7 - 28/20 is -29/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
4/7 = 4 × 20/7 × 20 = 80/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
28/20 = 28 × 7/20 × 7 = 196/140 - Subtract the two like fractions:
80/140 - 196/140 = 80 - 196/140 = -116/140 - After reducing the fraction, the answer is -29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-28/20 4/7-56/20 4/14-28/20 4/7-28/40 12/7-28/20 4/7-84/20 4/21-28/20 4/7-28/60 20/7-28/20 4/35-28/20 28/7-28/20 4/49-28/20