Mathematizing with Toddlers and Coaching Undergraduates: Foundations for Intentional Math Development

Kamiah, 24 months, stands at a ramp in the toddler room, gripping a baseball-size ball. She rolls it down a wooden ramp (that is shaped like a gutter), tracking it until it drops into a basket. She rushes over to the bin of balls nearby, uses both hands to grip a much larger ball, and places it on the same ramp.

Source: NAEYC