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Building large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third [video]. Retrieved from https://doi.org/doi:10.7282/T3XD1074
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Description
TitleBuilding large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third
PublisherNew Brunswick, NJ: Robert B. Davis Institute for Learning, , c1993-10-07
Persistent URLhttps://doi.org/doi:10.7282/T3XD1074
DescriptionIn the third clip David, Meredith, Erik, and Alan worked to build models on the floor using rods. David built a model to test his conjecture, while Erik continued working on the thirty-six centimeter model that he had begun building previously. He made a train of three orange and one dark green rod and lined up four blue rods. Alan continued to argue that Erik’s model would not work since he wouldn’t be able to third because he didn’t have big enough rods. Erik then showed Alan that he had found a way of showing thirds in his model. He lined up three blue rods and nine white rods against the model and showed that three white rods could be added to each blue rod to complete the third. Erik was asked by a visiting researcher to re-explain. He repeated his explanation and said that it was as if he made a new rod. The researcher asked Erik if there was another way to arrange the rods that he had used to show thirds. Meredith placed three white rods after each blue rod and Erik explained what she had done.
Math ToolCuisenaire rods
Math StrandFractions
Math ProblemFraction as number, Comparing fractions, Equivalent fractions
NCTM Grade Range3-5
NCTM Content StandardNumber and operations
NCTM Process StandardProblem solving, Reasoning and proof, Communication, Connections, Representation
Forms of Reasoning, Strategies and HeuristicsIndirect reasoning, Reasoning by upper and lower bounds, Direct reasoning
Grade Level4
Student ParticipantsDavid (student), Meredith (student), Erik (student), Alan (student)
CorporateConover Road (Colts Neck, N.J.)
SettingClassroom
Student GenderMixed
Student EthnicityWhite
Camera ViewsClassroom view, Side view
RightsThe video is protected by copyright. It is available for reviewing and use within the Video Mosaic Collaborative (VMC) portal. Please contact the Robert B. Davis Institute for Learning (RBDIL) for further information about the use of this video.
Date Captured1993-10-07
Local IdentifierA92A93-FRC-CMPRF-CLIP003
Related Publication
Type: Related publication
Label: Ed.D. dissertation references the video footage that includes Building large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third
Date: 2009
Author: Yankelewitz, Dina (Rutgers, the State University of New Jersey)
Name: The development of mathematical reasoning in elementary school students' exploration of fraction ideas
Reference: http://hdl.rutgers.edu/1782.1/rucore10001500001.ETD.000054787
Type: Related publication
Label: Ed.D. dissertation references the video footage that includes Building large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third
Date: 2009
Author: Yankelewitz, Dina (Rutgers, the State University of New Jersey)
Name: The development of mathematical reasoning in elementary school students' exploration of fraction ideas
Reference: http://hdl.rutgers.edu/1782.1/rucore10001500001.ETD.000054787
Related Publication
Type: Related publication
Label: Ed.D. dissertation references the video footage that includes Building large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third
Date: 2008
Author: Reynolds, Suzanne Loveridge (Rutgers, the State University of New Jersey)
Name: A study of fourth-grade students' explorations into comparing fractions
Reference: QA.R465 2005
Type: Related publication
Label: Ed.D. dissertation references the video footage that includes Building large models to show equivalence, an exploration, Clip 3 of 4: Erik justifies a train model for one third
Date: 2008
Author: Reynolds, Suzanne Loveridge (Rutgers, the State University of New Jersey)
Name: A study of fourth-grade students' explorations into comparing fractions
Reference: QA.R465 2005
Source
Title: A92, Building large models to show equivalence, an exploration (classroom view), Grade 4, October 7, 1993, raw footage.
Identifier: A92-19931007-CNCR-CV-CLASS-GR4-FRC-CMPRF-RAW
Title: A92, Building large models to show equivalence, an exploration (classroom view), Grade 4, October 7, 1993, raw footage.
Identifier: A92-19931007-CNCR-CV-CLASS-GR4-FRC-CMPRF-RAW
Source
Title: A93, Building large models to show equivalence, an exploration (side view), Grade 4, October 7, 1993, raw footage.
Identifier: A93-19931007-CNCR-SIV-CLASS-GR4-FRC-CMPRF-RAW
Title: A93, Building large models to show equivalence, an exploration (side view), Grade 4, October 7, 1993, raw footage.
Identifier: A93-19931007-CNCR-SIV-CLASS-GR4-FRC-CMPRF-RAW