Subtract 84/12 from 6/21
1st number: 6/21, 2nd number: 7 0/12
6/21 - 84/12 is -47/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
84/12 = 84 × 7/12 × 7 = 588/84 - Subtract the two like fractions:
24/84 - 588/84 = 24 - 588/84 = -564/84 - After reducing the fraction, the answer is -47/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-84/12 6/42-84/12 6/21-84/24 18/21-84/12 6/63-84/12 6/21-84/36 30/21-84/12 6/21-84/60 42/21-84/12