Subtract 81/30 from 3/15
1st number: 3/15, 2nd number: 2 21/30
3/15 - 81/30 is -5/2.
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,
3/15 = 3 × 2/15 × 2 = 6/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
81/30 = 81 × 1/30 × 1 = 81/30 - Subtract the two like fractions:
6/30 - 81/30 = 6 - 81/30 = -75/30 - After reducing the fraction, the answer is -5/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/15-81/30 3/30-81/30 3/15-81/60 9/15-81/30 3/45-81/30 3/15-81/90 3/75-81/30 21/15-81/30