Compare 80/21 and 3/90
1st number: 3 17/21, 2nd number: 3/90
80/21 is greater than 3/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
80/21 = 80 × 30/21 × 30 = 2400/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 2400/630 > 21/630 or 80/21 > 3/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21 and 6/90 80/42 and 3/90 80/21 and 9/90 80/63 and 3/90 80/21 and 15/90 80/21 and 21/90