Compare 30/45 and 42/81
30/45 is greater than 42/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 45 × 9 = 405,
30/45 = 30 × 9/45 × 9 = 270/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
42/81 = 42 × 5/81 × 5 = 210/405 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 270/405 > 210/405 or 30/45 > 42/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/45 and 42/81 30/45 and 84/81 30/90 and 42/81 90/45 and 42/81