Subtract 15/7 from 20/12
1st number: 1 8/12, 2nd number: 2 1/7
20/12 - 15/7 is -10/21.
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,
15/7 = 15 × 12/7 × 12 = 180/84 - Subtract the two like fractions:
140/84 - 180/84 = 140 - 180/84 = -40/84 - After reducing the fraction, the answer is -10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-15/7 20/12-30/7 20/24-15/7 20/12-15/14 60/12-15/7 20/12-45/7 20/36-15/7 20/12-15/21 20/12-75/7 20/60-15/7 20/12-15/35 20/84-15/7 20/12-15/49