Subtract 81/7 from 9/20
1st number: 9/20, 2nd number: 11 4/7
9/20 - 81/7 is -1557/140.
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,
9/20 = 9 × 7/20 × 7 = 63/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
81/7 = 81 × 20/7 × 20 = 1620/140 - Subtract the two like fractions:
63/140 - 1620/140 = 63 - 1620/140 = -1557/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-81/7 9/40-81/7 9/20-81/14 27/20-81/7 9/60-81/7 9/20-81/21 45/20-81/7 9/20-81/35 63/20-81/7 9/20-81/49