Compare 42/70 and 75/90
42/70 is smaller than 75/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
42/70 = 42 × 9/70 × 9 = 378/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
75/90 = 75 × 7/90 × 7 = 525/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 378/630 < 525/630 or 42/70 < 75/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70 and 75/90