Subtract 27/20 from 18/7
1st number: 2 4/7, 2nd number: 1 7/20
18/7 - 27/20 is 171/140.
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,
18/7 = 18 × 20/7 × 20 = 360/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
27/20 = 27 × 7/20 × 7 = 189/140 - Subtract the two like fractions:
360/140 - 189/140 = 360 - 189/140 = 171/140 - In mixed form: 131/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7-27/20 18/7-54/20 18/14-27/20 18/7-27/40 54/7-27/20 18/7-81/20 18/21-27/20 18/7-27/60 90/7-27/20 18/35-27/20 18/49-27/20