Compare 90/21 and 84/12
1st number: 4 6/21, 2nd number: 7 0/12
90/21 is smaller than 84/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
90/21 = 90 × 4/21 × 4 = 360/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
84/12 = 84 × 7/12 × 7 = 588/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 360/84 < 588/84 or 90/21 < 84/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42 and 84/12 90/21 and 84/24 90/63 and 84/12 90/21 and 84/36 90/21 and 84/60