Subtract 18/54 from 21/6
1st number: 3 3/6, 2nd number: 18/54
21/6 - 18/54 is 19/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 54 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 6 × 9 = 54,
21/6 = 21 × 9/6 × 9 = 189/54 - Likewise, for the 2nd fraction, since 54 × 1 = 54,
18/54 = 18 × 1/54 × 1 = 18/54 - Subtract the two like fractions:
189/54 - 18/54 = 189 - 18/54 = 171/54 - After reducing the fraction, the answer is 19/6
- In mixed form: 31/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-18/54 21/6-36/54 21/12-18/54 63/6-18/54 21/18-18/54 21/6-90/54 21/30-18/54 21/42-18/54