Subtract 5/7 from 3/20
3/20 - 5/7 is -79/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 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 7 × 20 = 140,
5/7 = 5 × 20/7 × 20 = 100/140 - Subtract the two like fractions:
21/140 - 100/140 = 21 - 100/140 = -79/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-5/7 3/20-10/7 3/40-5/7 3/20-5/14 9/20-5/7 3/20-15/7 3/60-5/7 3/20-5/21 15/20-5/7 3/20-25/7 3/20-5/35 21/20-5/7 3/20-35/7 3/20-5/49