Compare 72/21 and 45/80
1st number: 3 9/21, 2nd number: 45/80
72/21 is greater than 45/80
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
72/21 = 72 × 80/21 × 80 = 5760/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
45/80 = 45 × 21/80 × 21 = 945/1680 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 5760/1680 > 945/1680 or 72/21 > 45/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21 and 90/80 72/42 and 45/80 72/63 and 45/80