Subtract 9/20 from 21/24
21/24 - 9/20 is 17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 20 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 20 × 6 = 120,
9/20 = 9 × 6/20 × 6 = 54/120 - Subtract the two like fractions:
105/120 - 54/120 = 105 - 54/120 = 51/120 - After reducing the fraction, the answer is 17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-9/20 21/24-18/20 21/48-9/20 21/24-9/40 63/24-9/20 21/24-27/20 21/72-9/20 21/24-9/60 21/24-45/20 21/24-63/20