Regula de Tri, its origin and presentations in Icelandic textbooks
Regula de Tri, the Rule of Three, is in its simplest form a way of computing the fourth proportional in an equation of two ratios. It was an indispensable topic in Iceland from the first textbooks in arithmetic in the 18th century until the 1970s. Instruction in the Rule of Three in compulsory educa...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Book Part |
Language: | English |
Published: |
Sense Publisher
2009
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11815/4881 |
id |
ftopinvisindi:oai:opinvisindi.is:20.500.11815/4881 |
---|---|
record_format |
openpolar |
spelling |
ftopinvisindi:oai:opinvisindi.is:20.500.11815/4881 2024-06-02T08:09:15+00:00 Regula de Tri, its origin and presentations in Icelandic textbooks Bjarnadóttir, Kristín Winslow, Carl Education 2009 8 362287 321-328 https://hdl.handle.net/20.500.11815/4881 en eng Sense Publisher Nordic Research in Mathematic Education; () Bjarnadóttir , K 2009 , Regula de Tri, its origin and presentations in Icelandic textbooks . in C Winslow (ed.) , Nordic Research in Mathematic Education : Proceedings from NORMA08 in Copenhagen, April 21 - April 25, 2008 . , 47 , Sense Publisher , Rotterdam , pp. 321-328 , Nordic Conference on mathematics Education 2008 , Kaupmannahöfn , Denmark , 21/04/08 . conference 978-90-8790-781 5 221703550 89ab063e-3929-455d-900f-7c20ecbc025e https://hdl.handle.net/20.500.11815/4881 info:eu-repo/semantics/openAccess Mathematics (all) /dk/atira/pure/researchoutput/researchoutputtypes/contributiontobookanthology/chapter 2009 ftopinvisindi https://doi.org/20.500.11815/4881 2024-05-06T02:20:07Z Regula de Tri, the Rule of Three, is in its simplest form a way of computing the fourth proportional in an equation of two ratios. It was an indispensable topic in Iceland from the first textbooks in arithmetic in the 18th century until the 1970s. Instruction in the Rule of Three in compulsory education developed into a ritual procedure for exercises of certain types and content, often without relevance to contemporary life or reference to ratios and proportions. It was subjected to severe criticism at times of changes in compulsory education, in the early 20th century and at the introduction of the “New Math” in the 1960s. At that time the Rule of Three was quashed once and for all, and attention was turned to the plain concepts of ratio and proportions. Peer reviewed Book Part Iceland Opin vísindi (Iceland) |
institution |
Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
English |
topic |
Mathematics (all) |
spellingShingle |
Mathematics (all) Bjarnadóttir, Kristín Winslow, Carl Regula de Tri, its origin and presentations in Icelandic textbooks |
topic_facet |
Mathematics (all) |
description |
Regula de Tri, the Rule of Three, is in its simplest form a way of computing the fourth proportional in an equation of two ratios. It was an indispensable topic in Iceland from the first textbooks in arithmetic in the 18th century until the 1970s. Instruction in the Rule of Three in compulsory education developed into a ritual procedure for exercises of certain types and content, often without relevance to contemporary life or reference to ratios and proportions. It was subjected to severe criticism at times of changes in compulsory education, in the early 20th century and at the introduction of the “New Math” in the 1960s. At that time the Rule of Three was quashed once and for all, and attention was turned to the plain concepts of ratio and proportions. Peer reviewed |
author2 |
Education |
format |
Book Part |
author |
Bjarnadóttir, Kristín Winslow, Carl |
author_facet |
Bjarnadóttir, Kristín Winslow, Carl |
author_sort |
Bjarnadóttir, Kristín |
title |
Regula de Tri, its origin and presentations in Icelandic textbooks |
title_short |
Regula de Tri, its origin and presentations in Icelandic textbooks |
title_full |
Regula de Tri, its origin and presentations in Icelandic textbooks |
title_fullStr |
Regula de Tri, its origin and presentations in Icelandic textbooks |
title_full_unstemmed |
Regula de Tri, its origin and presentations in Icelandic textbooks |
title_sort |
regula de tri, its origin and presentations in icelandic textbooks |
publisher |
Sense Publisher |
publishDate |
2009 |
url |
https://hdl.handle.net/20.500.11815/4881 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Nordic Research in Mathematic Education; () Bjarnadóttir , K 2009 , Regula de Tri, its origin and presentations in Icelandic textbooks . in C Winslow (ed.) , Nordic Research in Mathematic Education : Proceedings from NORMA08 in Copenhagen, April 21 - April 25, 2008 . , 47 , Sense Publisher , Rotterdam , pp. 321-328 , Nordic Conference on mathematics Education 2008 , Kaupmannahöfn , Denmark , 21/04/08 . conference 978-90-8790-781 5 221703550 89ab063e-3929-455d-900f-7c20ecbc025e https://hdl.handle.net/20.500.11815/4881 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/4881 |
_version_ |
1800754932865826816 |