Compare 42/80 and 42/15, Which fraction is greater?

Compare 42/80 and 42/15

1^st number: 42/80, 2^nd number: 2 12/15

42/80 is smaller than 42/15

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 15 is 240

Next, find the equivalent fraction of both fractional numbers with denominator 240
For the 1st fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240
Likewise, for the 2nd fraction, since 15 × 16 = 240,
42/15 = 42 × 16/15 × 16 = 672/240
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
126/240 < 672/240 or 42/80 < 42/15

MathStep (Works offline)

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