IF I RAN 3/8 OF A MILE HOW MUCH FURTHER WOULD I HAVE TO RUN TO MAKE A MILE

3/8 + 5/8 = 1

so, you still have 5/8 to go.

and, believe it or not, "further" and "farther" are not interchangeable.

8/8 - 3/8 = ?

To calculate how much further you would have to run to reach a mile, you need to find the remaining distance after running 3/8 of a mile.

One way to calculate this is by subtracting the distance you have already run (3/8 mile) from a full mile (1 mile). Let's break it down step-by-step:

1. Start with 1 mile (the total distance you want to run).
2. Subtract the distance you have already run, which is 3/8 mile.
1 mile - 3/8 mile = 8/8 mile - 3/8 mile = 5/8 mile.

Therefore, you would have to run an additional 5/8 mile to reach a full mile.