Subtract 20/14 from 21/12
1st number: 1 9/12, 2nd number: 1 6/14
21/12 - 20/14 is 9/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 14 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
21/12 = 21 × 7/12 × 7 = 147/84 - Likewise, for the 2nd fraction, since 14 × 6 = 84,
20/14 = 20 × 6/14 × 6 = 120/84 - Subtract the two like fractions:
147/84 - 120/84 = 147 - 120/84 = 27/84 - After reducing the fraction, the answer is 9/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-20/14 21/12-40/14 21/24-20/14 21/12-20/28 63/12-20/14 21/12-60/14 21/36-20/14 21/12-20/42 21/60-20/14 21/12-20/70 21/84-20/14 21/12-20/98