Compare 30/36 and 21/90
30/36 is greater than 21/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
30/36 = 30 × 5/36 × 5 = 150/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 150/180 > 42/180 or 30/36 > 21/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/36 and 21/90 30/36 and 42/90 30/72 and 21/90 90/36 and 21/90 30/36 and 63/90