Subtract 8/42 from 21/6
1st number: 3 3/6, 2nd number: 8/42
21/6 - 8/42 is 139/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
21/6 = 21 × 7/6 × 7 = 147/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
8/42 = 8 × 1/42 × 1 = 8/42 - Subtract the two like fractions:
147/42 - 8/42 = 147 - 8/42 = 139/42 - In mixed form: 313/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-8/42 21/6-16/42 21/12-8/42 21/6-8/84 63/6-8/42 21/6-24/42 21/18-8/42 21/6-40/42 21/30-8/42 21/6-56/42 21/42-8/42