Subtract 64/6 from 21/40
1st number: 21/40, 2nd number: 10 4/6
21/40 - 64/6 is -1217/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 6 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 6 × 20 = 120,
64/6 = 64 × 20/6 × 20 = 1280/120 - Subtract the two like fractions:
63/120 - 1280/120 = 63 - 1280/120 = -1217/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40-64/6 21/80-64/6 21/40-64/12 63/40-64/6 21/40-64/18 21/40-64/30 21/40-64/42