Subtract 81/40 from 15/5
1st number: 3 0/5, 2nd number: 2 1/40
15/5 - 81/40 is 39/40.
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,
15/5 = 15 × 8/5 × 8 = 120/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
81/40 = 81 × 1/40 × 1 = 81/40 - Subtract the two like fractions:
120/40 - 81/40 = 120 - 81/40 = 39/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/5-81/40 15/10-81/40 15/5-81/80 45/5-81/40 75/5-81/40 15/25-81/40 15/35-81/40