Subtract 28/8 from 40/20
1st number: 2 0/20, 2nd number: 3 4/8
40/20 - 28/8 is -3/2.
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,
40/20 = 40 × 2/20 × 2 = 80/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
28/8 = 28 × 5/8 × 5 = 140/40 - Subtract the two like fractions:
80/40 - 140/40 = 80 - 140/40 = -60/40 - After reducing the fraction, the answer is -3/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/20-28/8 40/20-56/8 40/20-28/16 40/20-84/8 40/60-28/8 40/20-28/24 40/20-28/40 40/20-28/56