Subtract 9/24 from 21/40
21/40 - 9/24 is 3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
9/24 = 9 × 5/24 × 5 = 45/120 - Subtract the two like fractions:
63/120 - 45/120 = 63 - 45/120 = 18/120 - After reducing the fraction, the answer is 3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40-9/24 21/40-18/24 21/80-9/24 21/40-9/48 63/40-9/24 21/40-27/24 21/40-9/72 21/40-45/24 21/40-63/24