Subtract 30/20 from 20/80
1st number: 20/80, 2nd number: 1 10/20
20/80 - 30/20 is -5/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
20/80 = 20 × 1/80 × 1 = 20/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
30/20 = 30 × 4/20 × 4 = 120/80 - Subtract the two like fractions:
20/80 - 120/80 = 20 - 120/80 = -100/80 - After reducing the fraction, the answer is -5/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80-30/20 20/80-60/20 20/80-30/40 60/80-30/20 20/80-90/20 20/80-30/60