Compare 18/21 and 90/54
1st number: 18/21, 2nd number: 1 36/54
18/21 is smaller than 90/54
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
18/21 = 18 × 18/21 × 18 = 324/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 324/378 < 630/378 or 18/21 < 90/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21 and 90/54 18/42 and 90/54 54/21 and 90/54 18/63 and 90/54 90/21 and 90/54