Stacking Peg Towers
Play in pre-k or kindergarten can become an opportunity to explore measurement, as is the case in this classroom moment.

Why is this important?
Direct comparison of heights is a common feature of children’s play. Notice how the teacher asks a few questions to focus the children on height differences such as Which one is taller? and Can you reach all the way up there? She is “mathematizing” their natural interest, not taking over their play.