in repeated an understanding of the many horizontal layers physical structure of the were involved. There was reasoning. pyramid. He asked how a regularity of each layer many stacks of 13 pennies having one fewer set of were there on each side stacks of 13 pennies, and of the second lowest the top layer had 1 stack. horizontal layer. As a This repeated reasoning discussion ensued, the allowed them to create teacher guided, via their mathematical strategic questioning and model. showing strategic images, that there were 39 and not 38.
in repeated reasoning. an understanding of the physical structure of the pyramid. He asked how many stacks of 13 pennies were there on each side of the second lowest horizontal layer. As a discussion ensued, the teacher guided, via strategic questioning and showing strategic images, that there were 39 and not 38. many horizontal layers were involved. There was a regularity of each layer having one fewer set of stacks of 13 pennies, and the top layer had 1 stack. This repeated reasoning allowed them to create their mathematical model.