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ERIC Number: EJ805044
Record Type: Journal
Publication Date: 2008-Aug
Pages: 3
Abstractor: ERIC
Reference Count: 1
ISSN: ISSN-1072-0839
Subtraction of Positive and Negative Numbers: The Difference and Completion Approaches with Chips
Flores, Alfinio
Mathematics Teaching in the Middle School, v14 n1 p21-23 Aug 2008
Diverse contexts such as "take away," comparison," and "completion" give rise to subtraction problems. The take-away interpretation of subtraction has been explored using two-colored chips to help students understand addition and subtraction of integers. This article illustrates how the difference and completion (or missing addend) interpretations of subtraction may be used with chips of two colors to help students develop a better understanding of the subtraction of negative and positive numbers. (Contains 9 figures.)
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191-1502. Tel: 800-235-7566; Tel: 703-620-3702; Fax: 703-476-2970; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Middle Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A