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50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

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ERIC Number: EJ095243
Record Type: CIJE
Publication Date: 1974
Pages: N/A
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: N/A
Diagonal Sums: Practice, Discovery, and Proof
Litwiller, Bonnie H.; Duncan, David R.
School Science and Mathematics, 74, 3, 229-235, Mar 74
Descriptors: Addition, Elementary School Mathematics, Instruction, Mathematical Enrichment, Number Concepts, Pattern Recognition, Subtraction
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A
Identifiers: Proof (Mathematics); Properties (Mathematics)