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ERIC Number: EJ775047
Record Type: Journal
Publication Date: 2007-Sep
Pages: 3
Abstractor: ERIC
Reference Count: 7
ISSN: ISSN-0025-5785
Deconstructing Calculation Methods Part 2: Subtraction
Thompson, Ian
Mathematics Teaching Incorporating Micromath, n204 p6-8 Sep 2007
In this second of a series of four articles, the author deconstructs the primary national strategy's (PNS) approach to written subtraction. The approach to subtraction is divided into three stages: using the empty number line; partitioning; and expanded layout leading to column methods (called "standard methods" in the consultation document). The main subtraction goal is to have children progress inexorably towards the standard compact decomposition method. The procedure is introduced via the "expanded method," initially using an example that required no "exchanging" or "borrowing." (Contains 7 figures.) [For Part 1, see EJ768915.]
Association of Teachers of Mathematics. Unit 7 Prime Industrial Park, Shaftesbury Street, Derby, DE23 8YB, UK. Tel: +44-1332-346599; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A