Compare 9/4 and 90/21
1st number: 2 1/4, 2nd number: 4 6/21
9/4 is smaller than 90/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
9/4 = 9 × 21/4 × 21 = 189/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
90/21 = 90 × 4/21 × 4 = 360/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 189/84 < 360/84 or 9/4 < 90/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/4 and 90/21 9/8 and 90/21 9/4 and 90/42 27/4 and 90/21 9/12 and 90/21 9/4 and 90/63 45/4 and 90/21 9/20 and 90/21 63/4 and 90/21 9/28 and 90/21