Have you wanted some interesting activities you can use in your Calculus or Calculus AP class with slope fields.  Well here is a set of 25 matching cards that deal with different slope fields.
Each set of four cards has:

•  a card with the differential equation,
•  a card with the slope field
•  a card with a description, and
•  a card with a possible solution 

There are many ways you can use the cards in your classroom.  You don't have to use all the cards in one lesson.  You don't have to give all four cards out at the start.  If you don't give out the differential equation, the task would be to just match the description with the slope field and the possible solution, then students can come look at all the sets of differential equations and choose which fits their set of cards.

This is a great group activity.

Slope Field Matching Cards