Subtract 9/24 from 18/20
18/20 - 9/24 is 21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 20 × 6 = 120,
18/20 = 18 × 6/20 × 6 = 108/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
9/24 = 9 × 5/24 × 5 = 45/120 - Subtract the two like fractions:
108/120 - 45/120 = 108 - 45/120 = 63/120 - After reducing the fraction, the answer is 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-9/24 18/20-18/24 18/40-9/24 18/20-9/48 54/20-9/24 18/20-27/24 18/60-9/24 18/20-9/72 90/20-9/24 18/20-45/24 18/20-63/24