Subtract 45/8 from 28/20
1st number: 1 8/20, 2nd number: 5 5/8
28/20 - 45/8 is -169/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
28/20 = 28 × 2/20 × 2 = 56/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
45/8 = 45 × 5/8 × 5 = 225/40 - Subtract the two like fractions:
56/40 - 225/40 = 56 - 225/40 = -169/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-45/8 28/20-90/8 28/40-45/8 28/20-45/16 84/20-45/8 28/60-45/8 28/20-45/24 28/20-45/40 28/20-45/56