Subtract 21/9 from 15/10
1st number: 1 5/10, 2nd number: 2 3/9
15/10 - 21/9 is -5/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
15/10 = 15 × 9/10 × 9 = 135/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Subtract the two like fractions:
135/90 - 210/90 = 135 - 210/90 = -75/90 - After reducing the fraction, the answer is -5/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-21/9 15/10-42/9 15/20-21/9 15/10-21/18 45/10-21/9 15/10-63/9 15/30-21/9 15/10-21/27 75/10-21/9 15/50-21/9 15/10-21/45 15/70-21/9 15/10-21/63