Subtract 4/7 from 18/20
18/20 - 4/7 is 23/70.
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,
18/20 = 18 × 7/20 × 7 = 126/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
4/7 = 4 × 20/7 × 20 = 80/140 - Subtract the two like fractions:
126/140 - 80/140 = 126 - 80/140 = 46/140 - After reducing the fraction, the answer is 23/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-4/7 18/20-8/7 18/40-4/7 18/20-4/14 54/20-4/7 18/20-12/7 18/60-4/7 18/20-4/21 90/20-4/7 18/20-20/7 18/20-4/35 18/20-28/7 18/20-4/49