Subtract 12/24 from 21/18
1st number: 1 3/18, 2nd number: 12/24
21/18 - 12/24 is 2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 24 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
21/18 = 21 × 4/18 × 4 = 84/72 - Likewise, for the 2nd fraction, since 24 × 3 = 72,
12/24 = 12 × 3/24 × 3 = 36/72 - Subtract the two like fractions:
84/72 - 36/72 = 84 - 36/72 = 48/72 - After reducing the fraction, the answer is 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-12/24 21/36-12/24 21/18-12/48 63/18-12/24 21/18-36/24 21/54-12/24 21/18-12/72 21/18-60/24 21/90-12/24 21/18-84/24