The Times Tables as a Puzzle
The middle row of each pyramid is two facts of the times tables, and the top brick multiplies them together. With six pyramids per page, a child practices a dozen facts and six larger products on every sheet.
Dividing to Go Down
On the clue pages, a brick above a known one hides the factor that is missing below it: the product divided by the known factor gives it. These pages make division facts as familiar as the products themselves.
Why a 1 Is Rare
Multiplying by 1 leaves a number unchanged, so a base with several 1s would repeat bricks and teach little. Each base holds at most one, and the products stay varied.