Challenge students fourth grade and up to solve these Christmas equations. They'll be building their algebraic reasoning skills without even realizing it!

Students each found the area of their sector and the length of the arc. Then they moved around the classroom to find other students who made a complete circle. When they added the area of their sectors they got the area of the circle, and the arc lengths added up to the circumference. Fun in middle school Geometry!

From teacher at Region XIII (Texas) wkshp, Portal to the Universe. She used it to help kids see themselves INSIDE the earth-moon model for lunar phases.

Oh Christmas Tree: Slope Edition. This is a good tool to remember the different types of slope. I would have my students make these after we learned it in class as an activity to keep in their notebook. Rate of Change/Slope