Compare 80/90 and 15/40
80/90 is greater than 15/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
80/90 = 80 × 4/90 × 4 = 320/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
15/40 = 15 × 9/40 × 9 = 135/360 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 320/360 > 135/360 or 80/90 > 15/40
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 30/40 80/90 and 15/80 80/90 and 45/40 80/90 and 75/40