Subtract 6/21 from 18/12
1st number: 1 6/12, 2nd number: 6/21
18/12 - 6/21 is 17/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
18/12 = 18 × 7/12 × 7 = 126/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Subtract the two like fractions:
126/84 - 24/84 = 126 - 24/84 = 102/84 - After reducing the fraction, the answer is 17/14
- In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-6/21 18/12-12/21 18/24-6/21 18/12-6/42 54/12-6/21 18/12-18/21 18/36-6/21 18/12-6/63 90/12-6/21 18/12-30/21 18/60-6/21 18/12-42/21 18/84-6/21