I always liked to start the year with a counting project to promote number sense and place value skills. For many years my classes counted the number of bricks in the building. This was also intended to help students define, organize, and sequence the steps needed to do it. This is a picture of Maloney […]

## Classifying quadrilaterals with The Parallelogram Machine

The Parallelogram Machine is meant to illustrate why rectangles are also parallelograms. I have an activity entitled Quadrilateral Sorting, or How can a square be a Rectangle? that uses 3 models of these. As you can see, the machine makes only parallelograms. How does that work? Well, the opposite sides are equal. In the drawing above, […]