Subtract 9/10 from 21/24
21/24 - 9/10 is -1/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 10 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Likewise, for the 2nd fraction, since 10 × 12 = 120,
9/10 = 9 × 12/10 × 12 = 108/120 - Subtract the two like fractions:
105/120 - 108/120 = 105 - 108/120 = -3/120 - After reducing the fraction, the answer is -1/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-9/10 21/24-18/10 21/48-9/10 21/24-9/20 63/24-9/10 21/24-27/10 21/72-9/10 21/24-9/30 21/24-45/10 21/24-9/50 21/24-63/10 21/24-9/70