Subtract 56/8 from 21/18
1st number: 1 3/18, 2nd number: 7 0/8
21/18 - 56/8 is -35/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 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 8 × 9 = 72,
56/8 = 56 × 9/8 × 9 = 504/72 - Subtract the two like fractions:
84/72 - 504/72 = 84 - 504/72 = -420/72 - After reducing the fraction, the answer is -35/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-56/8 21/36-56/8 21/18-56/16 63/18-56/8 21/54-56/8 21/18-56/24 21/90-56/8 21/18-56/40