Subtract 81/12 from 15/10
1st number: 1 5/10, 2nd number: 6 9/12
15/10 - 81/12 is -21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 10 × 6 = 60,
15/10 = 15 × 6/10 × 6 = 90/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
81/12 = 81 × 5/12 × 5 = 405/60 - Subtract the two like fractions:
90/60 - 405/60 = 90 - 405/60 = -315/60 - After reducing the fraction, the answer is -21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-81/12 15/20-81/12 15/10-81/24 45/10-81/12 15/30-81/12 15/10-81/36 75/10-81/12 15/50-81/12 15/10-81/60 15/70-81/12 15/10-81/84