Compare 21/2 and 15/42
1st number: 10 1/2, 2nd number: 15/42
21/2 is greater than 15/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
21/2 = 21 × 21/2 × 21 = 441/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
15/42 = 15 × 1/42 × 1 = 15/42 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 441/42 > 15/42 or 21/2 > 15/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2 and 15/42 21/2 and 30/42 21/4 and 15/42 21/2 and 15/84 63/2 and 15/42 21/2 and 45/42 21/6 and 15/42 21/2 and 75/42 21/10 and 15/42 21/14 and 15/42