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Addition1
Elementary School Mathematics1
Instruction1
Mathematical Enrichment1
Number Concepts1
Pattern Recognition1
Subtraction1
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School Science and Mathematics1
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Duncan, David R.1
Litwiller, Bonnie H.1
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Diagonal Sums: Practice, Discovery, and Proof
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Litwiller, Bonnie H.; Duncan, David R. – School Science and Mathematics, 1974
Descriptors: Addition, Elementary School Mathematics, Instruction, Mathematical Enrichment