Subtract 81/40 from 4/5
1st number: 4/5, 2nd number: 2 1/40
4/5 - 81/40 is -49/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
4/5 = 4 × 8/5 × 8 = 32/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
81/40 = 81 × 1/40 × 1 = 81/40 - Subtract the two like fractions:
32/40 - 81/40 = 32 - 81/40 = -49/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5-81/40 4/10-81/40 4/5-81/80 12/5-81/40 4/15-81/40 20/5-81/40 4/25-81/40 28/5-81/40 4/35-81/40