Compare 18/21 and 4/9
18/21 is greater than 4/9
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
18/21 = 18 × 3/21 × 3 = 54/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
4/9 = 4 × 7/9 × 7 = 28/63 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 54/63 > 28/63 or 18/21 > 4/9
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 4/9 18/21 and 8/9 18/42 and 4/9 18/21 and 4/18 54/21 and 4/9 18/21 and 12/9 18/63 and 4/9 18/21 and 4/27 90/21 and 4/9 18/21 and 20/9 18/21 and 4/45 18/21 and 28/9 18/21 and 4/63