Compare 18/84 and 81/21
1st number: 18/84, 2nd number: 3 18/21
18/84 is smaller than 81/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
18/84 = 18 × 1/84 × 1 = 18/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
81/21 = 81 × 4/21 × 4 = 324/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 18/84 < 324/84 or 18/84 < 81/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84 and 81/21 18/84 and 81/42 54/84 and 81/21 18/84 and 81/63 90/84 and 81/21