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 […]

## Measuring angles as parts of circles

When we first introduce angles, we can immediately draw the connection between angles and circles. This is a rich and interesting relationship, and because we are drawing circles and angles, and measuring them numerically at the same time, we can clearly see the relationship between the numbers and the drawings. The following is taken from […]

## 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, […]