Subtract 21/8 from 21/24
1st number: 21/24, 2nd number: 2 5/8
21/24 - 21/8 is -7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 24 × 1 = 24,
21/24 = 21 × 1/24 × 1 = 21/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
21/8 = 21 × 3/8 × 3 = 63/24 - Subtract the two like fractions:
21/24 - 63/24 = 21 - 63/24 = -42/24 - After reducing the fraction, the answer is -7/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-21/8 21/24-42/8 21/48-21/8 21/24-21/16 63/24-21/8 21/24-63/8 21/72-21/8 21/24-21/24 21/24-21/40 21/24-21/56