Contexts for Learning Mathematics: The Double-Decker Bus: Early Addition and Subtraction (Gr. K-3)
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- The Double-Decker Bus, the story of a little girl's efforts to count the passengers on fast-moving double-decker buses, introduces students to the benefits of using the five-structure to quickly calculate quantities. The arithmetic rack, whose beads mirror the organization of seats on the buses, provides a model for solving addition and subtraction problems.