Subtract 7/20 from 20/28
20/28 - 7/20 is 51/140.
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,
20/28 = 20 × 5/28 × 5 = 100/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
7/20 = 7 × 7/20 × 7 = 49/140 - Subtract the two like fractions:
100/140 - 49/140 = 100 - 49/140 = 51/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-7/20 20/28-14/20 20/56-7/20 20/28-7/40 60/28-7/20 20/28-21/20 20/84-7/20 20/28-7/60 20/28-35/20 20/28-49/20