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ERIC Number: EJ891799
Record Type: Journal
Publication Date: 2010
Pages: 7
Abstractor: ERIC
Reference Count: 13
ISSN: ISSN-1326-0286
Decimats: Helping Students to Make Sense of Decimal Place Value
Roche, Anne
Australian Primary Mathematics Classroom, v15 n2 p4-10 2010
A considerable body of research exists on students' understanding of decimal fractions and the prevalence and persistence of common misconceptions related to this understanding. Results from major studies such as the National Assessment of Educational Progress (NAEP) in the United States and the Concepts in Secondary Mathematics and Science (CSMS) in Great Britain also indicated that decimals create great confusion for many students. A range of representational tools has been proposed to assist students as they develop understanding of decimal place value. In this article, the author describes an activity that helps students to make sense of decimal size and decimal place value and which encourages the use of fractional language to describe decimals. The activity involves the use of a Decimat, which is a proportional model for representing the size of decimal fractions and makes explicit the "ten-ness" of their base ten place value system. The Decimat was developed originally in New Zealand. An activity sheet is also included. (Contains 9 figures.)
Australian Association of Mathematics Teachers (AAMT). GPO Box 1729, Adelaide 5001, South Australia. Tel: +61-8-8363-0288; Fax: +61-8-8362-9288; e-mail:; Web site:
Publication Type: Guides - Classroom - Teacher; Journal Articles
Education Level: Elementary Education
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: New Zealand; United Kingdom (Great Britain); United States
Identifiers - Assessments and Surveys: National Assessment of Educational Progress