Subtract 21/6 from 7/8
1st number: 7/8, 2nd number: 3 3/6
7/8 - 21/6 is -21/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 6 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 8 × 3 = 24,
7/8 = 7 × 3/8 × 3 = 21/24 - Likewise, for the 2nd fraction, since 6 × 4 = 24,
21/6 = 21 × 4/6 × 4 = 84/24 - Subtract the two like fractions:
21/24 - 84/24 = 21 - 84/24 = -63/24 - After reducing the fraction, the answer is -21/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-21/6 7/8-42/6 7/16-21/6 7/8-21/12 21/8-21/6 7/8-63/6 7/24-21/6 7/8-21/18 35/8-21/6 7/40-21/6 7/8-21/30 49/8-21/6 7/56-21/6 7/8-21/42