Compare 90/45 and 81/7, Which fraction is greater?

Compare 90/45 and 81/7

1^st number: 2 0/45, 2^nd number: 11 4/7

90/45 is smaller than 81/7

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 45 × 7 = 315,
90/45 = 90 × 7/45 × 7 = 630/315
Likewise, for the 2nd fraction, since 7 × 45 = 315,
81/7 = 81 × 45/7 × 45 = 3645/315
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
630/315 < 3645/315 or 90/45 < 81/7

MathStep (Works offline)

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