Hi Holly:
Great idea to check before you buy, but you won't be able to use your tickets the way you describe. With a standard
Magic Your Way base ticket, you can enter, leave, and return to one Disney World park per day. For example, if your family uses a base ticket to enter the Magic Kingdom in the morning, you can leave the park to eat, return to your resort, relax at the pool, shop in Downtown Disney, or enjoy time at a spa. When you are ready to return to the Magic Kingdom that day, simply return to the park and present the same ticket you used earlier in the day. However, you cannot use an "extra" day of a base ticket to enter two different parks the same day.
For the flexibility to come and go through the four Walt Disney World Theme Parks on the same day for the duration of your trip, add the Park Hopper Option to your tickets.
Enjoy your vacation.