This fun Cinco de Mayo center is a great way to enforce a thorough understanding of addition and subtraction. My students love traditional "Write the Room" exercises, so this center is a take off of that idea.
I printed and laminated the picture cards, then hung them all around my classroom. When my students visit this center, they each get a clipboard and a copy of the record sheet. Then they walk around the room and write an addition or subtraction equation for each card. The answer key makes checking them a breeze, and also helps me see where each child needs help (switching a plus and minus sound around, for example).
This center reinforces several of the Kindergarten and First Grade Common Core objectives in Operations and Algebraic Thinking.