Compare 42/5 and 21/81
1st number: 8 2/5, 2nd number: 21/81
42/5 is greater than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
42/5 = 42 × 81/5 × 81 = 3402/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
21/81 = 21 × 5/81 × 5 = 105/405 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 3402/405 > 105/405 or 42/5 > 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/5 and 21/81 42/5 and 42/81 42/10 and 21/81 42/5 and 63/81 42/15 and 21/81 42/25 and 21/81 42/35 and 21/81