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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: EJ049009
Record Type: CIJE
Publication Date: 1971
Pages: N/A
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: N/A
Negative Number X Negative Number Gives Positive Number: An Understandable Proof for High School Students
Phillips, E. Ray
School Science and Mathematics, 71, 9, 797-800, Dec 71
Descriptors: Algebra, Instruction, Mathematics, Teaching Methods
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A
Identifiers: N/A