Subtract 8/7 from 72/20
1st number: 3 12/20, 2nd number: 1 1/7
72/20 - 8/7 is 86/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
8/7 = 8 × 20/7 × 20 = 160/140 - Subtract the two like fractions:
504/140 - 160/140 = 504 - 160/140 = 344/140 - After reducing the fraction, the answer is 86/35
- In mixed form: 216/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-16/7 72/40-8/7 72/20-8/14 72/20-24/7 72/60-8/7 72/20-8/21 72/20-40/7 72/20-8/35 72/20-56/7 72/20-8/49