Compare 40/20 and 15/21
1st number: 2 0/20, 2nd number: 15/21
40/20 is greater than 15/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
40/20 = 40 × 21/20 × 21 = 840/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
15/21 = 15 × 20/21 × 20 = 300/420 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 840/420 > 300/420 or 40/20 > 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/20 and 15/21 40/20 and 30/21 40/20 and 15/42 40/20 and 45/21 40/60 and 15/21 40/20 and 15/63 40/20 and 75/21