So, we want to know how many times 5 goes into 15.

Start with 15 pentagons:

We want to see how many chunks of 5 we can make out of 15 things!

We can divide 15 things into 3 chunks of 5.

Now, let's see how many times 3 will go into 15.

Start with 15 circles:

We want to see how many chunks of 3 we can make out of 15 things!

We can divide 15 things into 5 chunks of 3.