Compare 18/42 and 18/80
18/42 is greater than 18/80
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
18/42 = 18 × 40/42 × 40 = 720/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
18/80 = 18 × 21/80 × 21 = 378/1680 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 720/1680 > 378/1680 or 18/42 > 18/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42 and 18/80 18/42 and 36/80 18/84 and 18/80 54/42 and 18/80 18/42 and 54/80 90/42 and 18/80 18/42 and 90/80