Compare 27/45 and 21/42
27/45 is greater than 21/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
27/45 = 27 × 14/45 × 14 = 378/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
21/42 = 21 × 15/42 × 15 = 315/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 378/630 > 315/630 or 27/45 > 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/45 and 21/42 27/90 and 21/42 27/45 and 21/84 81/45 and 21/42 27/45 and 63/42