Subtract 80/45 from 20/7
1st number: 2 6/7, 2nd number: 1 35/45
20/7 - 80/45 is 68/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
20/7 = 20 × 45/7 × 45 = 900/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
80/45 = 80 × 7/45 × 7 = 560/315 - Subtract the two like fractions:
900/315 - 560/315 = 900 - 560/315 = 340/315 - After reducing the fraction, the answer is 68/63
- In mixed form: 15/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7-80/45 20/14-80/45 20/7-80/90 60/7-80/45 20/21-80/45 20/35-80/45 20/49-80/45