Subtract 45/5 from 81/40
1st number: 2 1/40, 2nd number: 9 0/5
81/40 - 45/5 is -279/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 5 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
81/40 = 81 × 1/40 × 1 = 81/40 - Likewise, for the 2nd fraction, since 5 × 8 = 40,
45/5 = 45 × 8/5 × 8 = 360/40 - Subtract the two like fractions:
81/40 - 360/40 = 81 - 360/40 = -279/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-90/5 81/80-45/5 81/40-45/10 81/40-45/15 81/40-45/25 81/40-45/35