Subtract 4/20 from 3/28
3/28 - 4/20 is -13/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
3/28 = 3 × 5/28 × 5 = 15/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
4/20 = 4 × 7/20 × 7 = 28/140 - Subtract the two like fractions:
15/140 - 28/140 = 15 - 28/140 = -13/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/28-4/20 3/28-8/20 3/56-4/20 3/28-4/40 9/28-4/20 3/28-12/20 3/84-4/20 3/28-4/60 15/28-4/20 21/28-4/20 3/28-28/20