In This Series
A Clothespin for Every Side – Math at 21 Months: A 21-month-old child creates two equal sets
Too Big: Young boys compare the sizes of objects and containers
Pajama Count: Counting small tiles - Working on a method that yields the same total each time
Sorting by Size: Two children decide what should be counted as the same class
Measuring Tape: Measuring height with a tape - Using the length of a segment of tape vs. the indicated inches on the tape
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
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
Math – Combining Sets: Two boys combine sets of five blocks - What they know and what they will eventually learn
A String Too Short: The challenge of thinking about both ends of a length of string
Unequal Weights Can Balance: When unequal weights balance on a tilting board - Figuring out that the pivot point on a curved fulcrum can change