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Early Mathematical Thinking
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A Clothespin for Every Side – Math at 21 Months - A 21-month-old child creates two equal sets
02:00
Too Big - Young boys compare the sizes of objects and containers
01:10
Pajama Count - Counting small tiles - Working on a method that yields the same total each time
02:07
Sorting by Size - Two children decide what should be counted as the same class
04:18
Measuring Tape - Measuring height with a tape - Using the length of a segment of tape vs. the indicated inches on the tape
03:17
The Sound of Slope and Speed - Rolling a ball down an incline with chimes at equal intervals - Discovering the relation between angle, speed, and rhythm
04:41
Counting – Stuck in the 20’s - The difficulty of counting beyond twenty - Dealing with the problems of skip counting, double counting, and the number word sequence
04:53
Math – Combining Sets - Two boys combine sets of five blocks - What they know and what they will eventually learn
04:18
A String Too Short - The challenge of thinking about both ends of a length of string
05:21
Unequal Weights Can Balance - When unequal weights balance on a tilting board - Figuring out that the pivot point on a curved fulcrum can change
02:30