Subtract 27/7 from 81/20
1st number: 4 1/20, 2nd number: 3 6/7
81/20 - 27/7 is 27/140.
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,
81/20 = 81 × 7/20 × 7 = 567/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
27/7 = 27 × 20/7 × 20 = 540/140 - Subtract the two like fractions:
567/140 - 540/140 = 567 - 540/140 = 27/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-54/7 81/40-27/7 81/20-27/14 81/20-81/7 81/60-27/7 81/20-27/21 81/20-27/35 81/20-27/49