Subtract 21/18 from 21/6
1st number: 3 3/6, 2nd number: 1 3/18
21/6 - 21/18 is 7/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 6 × 3 = 18,
21/6 = 21 × 3/6 × 3 = 63/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
21/18 = 21 × 1/18 × 1 = 21/18 - Subtract the two like fractions:
63/18 - 21/18 = 63 - 21/18 = 42/18 - After reducing the fraction, the answer is 7/3
- In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-21/18 21/6-42/18 21/12-21/18 21/6-21/36 63/6-21/18 21/6-63/18 21/18-21/18 21/6-21/54 21/30-21/18 21/6-21/90 21/42-21/18