Subtract 20/7 from 45/12
1st number: 3 9/12, 2nd number: 2 6/7
45/12 - 20/7 is 25/28.
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,
45/12 = 45 × 7/12 × 7 = 315/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
20/7 = 20 × 12/7 × 12 = 240/84 - Subtract the two like fractions:
315/84 - 240/84 = 315 - 240/84 = 75/84 - After reducing the fraction, the answer is 25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-20/7 45/12-40/7 45/24-20/7 45/12-20/14 45/12-60/7 45/36-20/7 45/12-20/21 45/60-20/7 45/12-20/35 45/84-20/7 45/12-20/49