Compare 54/21 and 90/30
1st number: 2 12/21, 2nd number: 3 0/30
54/21 is smaller than 90/30
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
54/21 = 54 × 10/21 × 10 = 540/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 540/210 < 630/210 or 54/21 < 90/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42 and 90/30 54/21 and 90/60 54/63 and 90/30