Compare 42/20 and 8/81, Which fraction is greater?

Compare 42/20 and 8/81

1^st number: 2 2/20, 2^nd number: 8/81

42/20 is greater than 8/81

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620

Next, find the equivalent fraction of both fractional numbers with denominator 1620
For the 1st fraction, since 20 × 81 = 1620,
42/20 = 42 × 81/20 × 81 = 3402/1620
Likewise, for the 2nd fraction, since 81 × 20 = 1620,
8/81 = 8 × 20/81 × 20 = 160/1620
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
3402/1620 > 160/1620 or 42/20 > 8/81

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad