Subtract 20/8 from 72/9
1st number: 8 0/9, 2nd number: 2 4/8
72/9 - 20/8 is 11/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
72/9 = 72 × 8/9 × 8 = 576/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
20/8 = 20 × 9/8 × 9 = 180/72 - Subtract the two like fractions:
576/72 - 180/72 = 576 - 180/72 = 396/72 - After reducing the fraction, the answer is 11/2
- In mixed form: 51/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/9-40/8 72/18-20/8 72/9-20/16 72/9-60/8 72/27-20/8 72/9-20/24 72/45-20/8 72/9-20/40 72/63-20/8 72/9-20/56