Subtract 81/40 from 18/3
1st number: 6 0/3, 2nd number: 2 1/40
18/3 - 81/40 is 159/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 3 × 40 = 120,
18/3 = 18 × 40/3 × 40 = 720/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
81/40 = 81 × 3/40 × 3 = 243/120 - Subtract the two like fractions:
720/120 - 243/120 = 720 - 243/120 = 477/120 - After reducing the fraction, the answer is 159/40
- In mixed form: 339/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/3-81/40 18/6-81/40 18/3-81/80 54/3-81/40 18/9-81/40 90/3-81/40 18/15-81/40 18/21-81/40