Subtract 6/21 from 42/12
1st number: 3 6/12, 2nd number: 6/21
42/12 - 6/21 is 45/14.
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,
42/12 = 42 × 7/12 × 7 = 294/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Subtract the two like fractions:
294/84 - 24/84 = 294 - 24/84 = 270/84 - After reducing the fraction, the answer is 45/14
- In mixed form: 33/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-6/21 42/12-12/21 42/24-6/21 42/12-6/42 42/12-18/21 42/36-6/21 42/12-6/63 42/12-30/21 42/60-6/21 42/12-42/21 42/84-6/21