Subtract 45/18 from 28/20
1st number: 1 8/20, 2nd number: 2 9/18
28/20 - 45/18 is -11/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 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 18 × 10 = 180,
45/18 = 45 × 10/18 × 10 = 450/180 - Subtract the two like fractions:
252/180 - 450/180 = 252 - 450/180 = -198/180 - After reducing the fraction, the answer is -11/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-45/18 28/20-90/18 28/40-45/18 28/20-45/36 84/20-45/18 28/60-45/18 28/20-45/54 28/20-45/90