Compare 4/18 and 21/81
4/18 is smaller than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 18 × 9 = 162,
4/18 = 4 × 9/18 × 9 = 36/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
21/81 = 21 × 2/81 × 2 = 42/162 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 36/162 < 42/162 or 4/18 < 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/18 and 21/81 4/18 and 42/81 4/36 and 21/81 12/18 and 21/81 4/18 and 63/81 4/54 and 21/81 20/18 and 21/81 4/90 and 21/81 28/18 and 21/81