Compare 45/9 and 21/40, Which fraction is greater?

Compare 45/9 and 21/40

1^st number: 5 0/9, 2^nd number: 21/40

45/9 is greater than 21/40

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 9 × 40 = 360,
45/9 = 45 × 40/9 × 40 = 1800/360
Likewise, for the 2nd fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
1800/360 > 189/360 or 45/9 > 21/40

MathStep (Works offline)

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