Subtract 7/28 from 3/20
3/20 - 7/28 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
3/20 = 3 × 7/20 × 7 = 21/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
7/28 = 7 × 5/28 × 5 = 35/140 - Subtract the two like fractions:
21/140 - 35/140 = 21 - 35/140 = -14/140 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-7/28 3/20-14/28 3/40-7/28 3/20-7/56 9/20-7/28 3/20-21/28 3/60-7/28 3/20-7/84 15/20-7/28 3/20-35/28 21/20-7/28 3/20-49/28