Compare 45/30 and 42/21
1st number: 1 15/30, 2nd number: 2 0/21
45/30 is smaller than 42/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
45/30 = 45 × 7/30 × 7 = 315/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 315/210 < 420/210 or 45/30 < 42/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30 and 42/21 45/30 and 84/21 45/60 and 42/21 45/90 and 42/21 45/30 and 42/63