Subtract 40/10 from 28/20
1st number: 1 8/20, 2nd number: 4 0/10
28/20 - 40/10 is -13/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
28/20 = 28 × 1/20 × 1 = 28/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
40/10 = 40 × 2/10 × 2 = 80/20 - Subtract the two like fractions:
28/20 - 80/20 = 28 - 80/20 = -52/20 - After reducing the fraction, the answer is -13/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-40/10 28/20-80/10 28/40-40/10 28/20-40/20 84/20-40/10 28/60-40/10 28/20-40/30 28/20-40/50 28/20-40/70