Figures from Figures Doing Arithmetic and Algebra by Geometry
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We can learn a good deal of arithmetic just by writing the numbers in rows of 1, 2, 3, . . . , as in Figure 2.1. The left-hand column in each section is the list of multiples of the number of entries in each row.
KeywordsResidue Class Multiplication Table Jigsaw Puzzle Triangular Number Pythagorean Triple
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