Subtract 15/10 from 15/81
1st number: 15/81, 2nd number: 1 5/10
15/81 - 15/10 is -71/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
15/81 = 15 × 10/81 × 10 = 150/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
15/10 = 15 × 81/10 × 81 = 1215/810 - Subtract the two like fractions:
150/810 - 1215/810 = 150 - 1215/810 = -1065/810 - After reducing the fraction, the answer is -71/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81-15/10 15/81-30/10 15/81-15/20 45/81-15/10 15/81-45/10 15/81-15/30 75/81-15/10 15/81-75/10 15/81-15/50 15/81-15/70