Compare 90/70 and 15/80
1st number: 1 20/70, 2nd number: 15/80
90/70 is greater than 15/80
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
90/70 = 90 × 8/70 × 8 = 720/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
15/80 = 15 × 7/80 × 7 = 105/560 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 720/560 > 105/560 or 90/70 > 15/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70 and 30/80 90/70 and 45/80 90/70 and 75/80