Arithmetic of the Productive System: Accompanied by a Key and Cubical Blocks (Classic Reprint) - Softcover

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Excerpt from Arithmetic of the Productive System: Accompanied by a Key and Cubical Blocks

II. 1. Thomas has 3 dollars and Rufus 5 dollars. How many dollars have they both? Say 3 and 5 are 8. A. 8 dollars.

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