Compare 5/81 and 18/5
1st number: 5/81, 2nd number: 3 3/5
5/81 is smaller than 18/5
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 5 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
5/81 = 5 × 5/81 × 5 = 25/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
18/5 = 18 × 81/5 × 81 = 1458/405 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 25/405 < 1458/405 or 5/81 < 18/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81 and 18/5 5/81 and 36/5 5/81 and 18/10 15/81 and 18/5 5/81 and 54/5 5/81 and 18/15 25/81 and 18/5 5/81 and 90/5 5/81 and 18/25 35/81 and 18/5 5/81 and 18/35