Compare 3/18 and 1/21
3/18 is greater than 1/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
3/18 = 3 × 7/18 × 7 = 21/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
1/21 = 1 × 6/21 × 6 = 6/126 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 21/126 > 6/126 or 3/18 > 1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18 and 1/21 3/18 and 2/21 3/36 and 1/21 3/18 and 1/42 9/18 and 1/21 3/18 and 3/21 3/54 and 1/21 3/18 and 1/63 15/18 and 1/21 3/18 and 5/21 3/90 and 1/21 21/18 and 1/21 3/18 and 7/21