Compare 80/90 and 30/42
80/90 is greater than 30/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
80/90 = 80 × 7/90 × 7 = 560/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
30/42 = 30 × 15/42 × 15 = 450/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 560/630 > 450/630 or 80/90 > 30/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90 and 60/42 80/90 and 30/84 80/90 and 90/42