Subtract 21/20 from 18/50
1st number: 18/50, 2nd number: 1 1/20
18/50 - 21/20 is -69/100.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 20 is 100
Next, find the equivalent fraction of both fractional numbers with denominator 100 - For the 1st fraction, since 50 × 2 = 100,
18/50 = 18 × 2/50 × 2 = 36/100 - Likewise, for the 2nd fraction, since 20 × 5 = 100,
21/20 = 21 × 5/20 × 5 = 105/100 - Subtract the two like fractions:
36/100 - 105/100 = 36 - 105/100 = -69/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/50-21/20 18/50-42/20 18/50-21/40 54/50-21/20 18/50-63/20 18/50-21/60 90/50-21/20