Subtract 18/12 from 21/6
1st number: 3 3/6, 2nd number: 1 6/12
21/6 - 18/12 is 2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 6 × 2 = 12,
21/6 = 21 × 2/6 × 2 = 42/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
18/12 = 18 × 1/12 × 1 = 18/12 - Subtract the two like fractions:
42/12 - 18/12 = 42 - 18/12 = 24/12 - After reducing the fraction, the answer is 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-18/12 21/6-36/12 21/12-18/12 21/6-18/24 63/6-18/12 21/6-54/12 21/18-18/12 21/6-18/36 21/6-90/12 21/30-18/12 21/6-18/60 21/42-18/12 21/6-18/84