Subtract 18/24 from 21/8
1st number: 2 5/8, 2nd number: 18/24
21/8 - 18/24 is 15/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 24 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 8 × 3 = 24,
21/8 = 21 × 3/8 × 3 = 63/24 - Likewise, for the 2nd fraction, since 24 × 1 = 24,
18/24 = 18 × 1/24 × 1 = 18/24 - Subtract the two like fractions:
63/24 - 18/24 = 63 - 18/24 = 45/24 - After reducing the fraction, the answer is 15/8
- In mixed form: 17/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-18/24 21/8-36/24 21/16-18/24 21/8-18/48 63/8-18/24 21/8-54/24 21/24-18/24 21/8-18/72 21/8-90/24 21/40-18/24 21/56-18/24