Compare 15/90 and 8/21
15/90 is smaller than 8/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
8/21 = 8 × 30/21 × 30 = 240/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/630 < 240/630 or 15/90 < 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/90 and 8/21 15/90 and 16/21 15/90 and 8/42 45/90 and 8/21 15/90 and 24/21 15/90 and 8/63 75/90 and 8/21 15/90 and 40/21 15/90 and 56/21