Subtract 30/8 from 21/56
1st number: 21/56, 2nd number: 3 6/8
21/56 - 30/8 is -27/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 56 × 1 = 56,
21/56 = 21 × 1/56 × 1 = 21/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
30/8 = 30 × 7/8 × 7 = 210/56 - Subtract the two like fractions:
21/56 - 210/56 = 21 - 210/56 = -189/56 - After reducing the fraction, the answer is -27/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-30/8 21/56-60/8 21/56-30/16 63/56-30/8 21/56-90/8 21/56-30/24 21/56-30/40 21/56-30/56