Subtract 1/20 from 4/7
4/7 - 1/20 is 73/140.
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,
1/20 = 1 × 7/20 × 7 = 7/140 - Subtract the two like fractions:
80/140 - 7/140 = 80 - 7/140 = 73/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-1/20 4/7-2/20 4/14-1/20 4/7-1/40 12/7-1/20 4/7-3/20 4/21-1/20 4/7-1/60 20/7-1/20 4/7-5/20 4/35-1/20 28/7-1/20 4/7-7/20 4/49-1/20