Content atlas · skill

Count outcomes systematically without omission or duplication

The learner can count outcomes systematically without omission or duplication. This capability is distinct from mere exposure to or isolated use of tables, lists, multiplication principle.

3 published problems

1. The Knight’s Missing Numbers — Build a knight-move-count map for one outlined quarter of a chessboard and discover which counts never occur anywhere on the board.
2. Knightmare — Track a knight through a cube of 512 rooms and find a way to classify every possible move number without checking the rooms one at a time.
3. U + Me = Us: The Screen Test — Turn 2gether’s famous title equation into a digit puzzle and find every screen that works.