Subtract 56/8 from 21/40
1st number: 21/40, 2nd number: 7 0/8
21/40 - 56/8 is -259/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
56/8 = 56 × 5/8 × 5 = 280/40 - Subtract the two like fractions:
21/40 - 280/40 = 21 - 280/40 = -259/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40-56/8 21/80-56/8 21/40-56/16 63/40-56/8 21/40-56/24 21/40-56/40