Subtract 72/9 from 28/20
1st number: 1 8/20, 2nd number: 8 0/9
28/20 - 72/9 is -33/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
28/20 = 28 × 9/20 × 9 = 252/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
72/9 = 72 × 20/9 × 20 = 1440/180 - Subtract the two like fractions:
252/180 - 1440/180 = 252 - 1440/180 = -1188/180 - After reducing the fraction, the answer is -33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-72/9 28/40-72/9 28/20-72/18 84/20-72/9 28/60-72/9 28/20-72/27 28/20-72/45 28/20-72/63