Subtract 21/36 from 21/8
1st number: 2 5/8, 2nd number: 21/36
21/8 - 21/36 is 49/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 36 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Likewise, for the 2nd fraction, since 36 × 2 = 72,
21/36 = 21 × 2/36 × 2 = 42/72 - Subtract the two like fractions:
189/72 - 42/72 = 189 - 42/72 = 147/72 - After reducing the fraction, the answer is 49/24
- In mixed form: 21/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-21/36 21/8-42/36 21/16-21/36 21/8-21/72 63/8-21/36 21/8-63/36 21/24-21/36 21/40-21/36 21/56-21/36