Subtract 9/7 from 20/12
1st number: 1 8/12, 2nd number: 1 2/7
20/12 - 9/7 is 8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
20/12 = 20 × 7/12 × 7 = 140/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
9/7 = 9 × 12/7 × 12 = 108/84 - Subtract the two like fractions:
140/84 - 108/84 = 140 - 108/84 = 32/84 - After reducing the fraction, the answer is 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-9/7 20/12-18/7 20/24-9/7 20/12-9/14 60/12-9/7 20/12-27/7 20/36-9/7 20/12-9/21 20/12-45/7 20/60-9/7 20/12-9/35 20/12-63/7 20/84-9/7 20/12-9/49