Getallenlijn verder met 10 How to make a Montessori "teen" board (Adding n = teen number) >>Take it further by adding 10 to other double digit numbers. Could make multiple sets for centers out of index cards.
[November Week Triangle]**FREE** Shapes: All About Triangles Worksheet. Learn all about the shape triangle in this math printable worksheet. Practice tracing, drawing, coloring pictures of triangles, writing the number of sides and corners.