# Early Mathematical Thinking

## 10 videos in this playlist

A Clothespin for Every Side – Math at 21 Months
In this video, a 21-month-old child finds satisfaction in fitting wooden clothespins over the edge of a square plastic container. Making separate objects fit together and stay together has universal…
Too Big
In this video clip, Ben and Henry enjoy determining what toys fit inside a large tube stood on one end. The toddlers are engaging in mathematical thinking by estimating, or…
Pajama Count
Lincoln and Golden, two preschool age children, at school on pajama day, are working to arrange and count tiles on the floor. Golden uses many strategies to help him count…
Sorting by Size
In this video clip, Kaia and Lincoln agree to begin sorting a collection of donated materials by separating out the glass pebbles, which the children refer to as marbles. The…
Measuring Tape
In this video, Lane and Molly are working together, using a measuring tape to measure their height. The children use world knowledge to guide their discussion about how to measure…
The Sound of Slope and Speed
The pre-kindergarten children in this video clip are involved in a long-term investigation, using ramps and chimes on a large magnetic wall. A group of children who previously investigated sound…
Counting – Stuck in the 20’s
Ethan and Eli, almost five years old, take turns counting approximately 40 seeds. If we watch the details of their actions, we see a number of cases where they give…
Math – Combining Sets
Watch these two boys count small sets of blocks and then combine them to double the count. Sammy, in green, counts "Three, four, five, I got five." Notice the emphasis…
A String Too Short
Two five-year-old boys work to make a length of string taut, from the table to the floor, so imaginary animals can safely slide down into the water. At 00:30, Henry…
Unequal Weights Can Balance
Physics can surprise us when a condition exists that we do not consider. In this video a child balances log cross-sections on a board that rests on a large curved…

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