Compare 21/4 and 24/90, Which fraction is greater?

Compare 21/4 and 24/90

1^st number: 5 1/4, 2^nd number: 24/90

21/4 is greater than 24/90

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 4 × 45 = 180,
21/4 = 21 × 45/4 × 45 = 945/180
Likewise, for the 2nd fraction, since 90 × 2 = 180,
24/90 = 24 × 2/90 × 2 = 48/180
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
945/180 > 48/180 or 21/4 > 24/90

MathStep (Works offline)

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