Subtract 72/20 from 8/9
1st number: 8/9, 2nd number: 3 12/20
8/9 - 72/20 is -122/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
8/9 = 8 × 20/9 × 20 = 160/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
72/20 = 72 × 9/20 × 9 = 648/180 - Subtract the two like fractions:
160/180 - 648/180 = 160 - 648/180 = -488/180 - After reducing the fraction, the answer is -122/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/9-72/20 8/18-72/20 8/9-72/40 24/9-72/20 8/27-72/20 8/9-72/60 40/9-72/20 8/45-72/20 56/9-72/20 8/63-72/20