To solve this, you have to subtract the number of miles Cory ran from the number of miles Carrie ran. To do this, I would turn the improper fractions into mixed numbers. So, 8(5/8) = 69/8 and 5(1/4) = 21/4. Now, we have to find a common denominator which would be 8. To make 21/4 have a denominator of eight, multiply both he numerator and the denominator by 2, which will give you 42/8. Now, you can perform 69/8 - 42/8 which gives you 27/8. Next, simply turn this number back into a mixed number, which would be 3(3/8) miles. Hope this helps!
