Compare 6/21 and 18/50, Which fraction is greater?

Compare 6/21 and 18/50

6/21 is smaller than 18/50

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,
6/21 = 6 × 50/21 × 50 = 300/1050
Likewise, for the 2nd fraction, since 50 × 21 = 1050,
18/50 = 18 × 21/50 × 21 = 378/1050
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
300/1050 < 378/1050 or 6/21 < 18/50

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad