Test Prep Problem #2

Mrs. M is buying the ingredients for her famous Halloween punch. She needs to buy the candy spiders.  They come in packages of 25. Mrs. M needs 500 spiders for her punch.  How many packages of spiders will Mrs. M need to buy?  

Explain your thinking. This part is tricky, I know, but if you explain the strategy you used and try not to explain it like a story, you'll do great.