Subtract 9/50 from 20/21
20/21 - 9/50 is 811/1050.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 50 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 21 × 50 = 1050,
20/21 = 20 × 50/21 × 50 = 1000/1050 - Likewise, for the 2nd fraction, since 50 × 21 = 1050,
9/50 = 9 × 21/50 × 21 = 189/1050 - Subtract the two like fractions:
1000/1050 - 189/1050 = 1000 - 189/1050 = 811/1050
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-9/50 20/21-18/50 20/42-9/50 60/21-9/50 20/21-27/50 20/63-9/50 20/21-45/50 20/21-63/50