Compare 90/20 and 15/21
1st number: 4 10/20, 2nd number: 15/21
90/20 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,
90/20 = 90 × 21/20 × 21 = 1890/420 - 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
- 1890/420 > 300/420 or 90/20 > 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20 and 30/21 90/40 and 15/21 90/20 and 15/42 90/20 and 45/21 90/60 and 15/21 90/20 and 15/63 90/20 and 75/21