Subtract 21/50 from 8/18
8/18 - 21/50 is 11/450.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 18 × 25 = 450,
8/18 = 8 × 25/18 × 25 = 200/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
21/50 = 21 × 9/50 × 9 = 189/450 - Subtract the two like fractions:
200/450 - 189/450 = 200 - 189/450 = 11/450
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-21/50 8/18-42/50 8/36-21/50 24/18-21/50 8/18-63/50 8/54-21/50 40/18-21/50 8/90-21/50 56/18-21/50