This activity can help children with angles. Instead of measuring angles on paper, this can illustrate angles into a read life demonstration. This is active learning because as children close the door the angle changes and they can now measure it.
Fourth Grade Algebra & Functions Activities: Make a Flip Book for Place Value - I could make these with my comb binder and laminate the pages for durability.
Sierpinski pyramid created by high school math students. Pyramid grid paper, scissors, and tape!
Equivalent Fraction posters - good "benchmark fraction" visual for early in the year!
These 13 animals made from 13 circles that has been made by Dorota Pankowska aka Dori. He is art director. He made these 13 animals from 13 circles.