Compare 20/5 and 45/21
1st number: 4 0/5, 2nd number: 2 3/21
20/5 is greater than 45/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
20/5 = 20 × 21/5 × 21 = 420/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
45/21 = 45 × 5/21 × 5 = 225/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 420/105 > 225/105 or 20/5 > 45/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5 and 45/21 20/5 and 90/21 20/10 and 45/21 20/5 and 45/42 60/5 and 45/21 20/15 and 45/21 20/5 and 45/63 20/25 and 45/21 20/35 and 45/21