Compare 18/12 and 21/90
1st number: 1 6/12, 2nd number: 21/90
18/12 is greater than 21/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
18/12 = 18 × 15/12 × 15 = 270/180 - 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
- 270/180 > 42/180 or 18/12 > 21/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12 and 21/90 18/12 and 42/90 18/24 and 21/90 54/12 and 21/90 18/12 and 63/90 18/36 and 21/90 90/12 and 21/90 18/60 and 21/90 18/84 and 21/90