Subtract 40/30 from 81/15
1st number: 5 6/15, 2nd number: 1 10/30
81/15 - 40/30 is 61/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
81/15 = 81 × 2/15 × 2 = 162/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
40/30 = 40 × 1/30 × 1 = 40/30 - Subtract the two like fractions:
162/30 - 40/30 = 162 - 40/30 = 122/30 - After reducing the fraction, the answer is 61/15
- In mixed form: 41/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/15-80/30 81/30-40/30 81/15-40/60 81/45-40/30 81/15-40/90 81/75-40/30