Subtract 81/7 from 36/20
1st number: 1 16/20, 2nd number: 11 4/7
36/20 - 81/7 is -342/35.
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,
36/20 = 36 × 7/20 × 7 = 252/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
81/7 = 81 × 20/7 × 20 = 1620/140 - Subtract the two like fractions:
252/140 - 1620/140 = 252 - 1620/140 = -1368/140 - After reducing the fraction, the answer is -342/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-81/7 36/40-81/7 36/20-81/14 36/60-81/7 36/20-81/21 36/20-81/35 36/20-81/49