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Word problems with addition and subtraction, Stephanie's group, Clip 1 of 9: Problem 1, how many more legos does David have than John? [video]. Retrieved from https://doi.org/doi:10.7282/T3HQ3WV3

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TitleWord problems with addition and subtraction, Stephanie's group, Clip 1 of 9: Problem 1, how many more legos does David have than John?
PublisherNew Brunswick, NJ: Robert B. Davis Institute for Learning, 1989-03-21, c
Persistent URLhttps://doi.org/doi:10.7282/T3HQ3WV3
DescriptionIn the first of nine clips in a first grade classroom, Teacher Angela Marinaro introduces the day's activity and distributes a packet of problems to each child. She asks the students to identify the physical materials that are on each desk. The children respond that there are unifix cubes and colored stones. Stephanie volunteers to read the first problem to her group which includes Stephanie, Sean, Gerardo and Aaron. The four children begin to model the problem with stones or unifix cubes. Researcher Alice Alston asks the children to explain their reasoning and to compare their ideas with each other. Although there is some disagreement among the children as to whether the answer is 8 or 9, the students, all now using unifix cubes to model the problem, record the answer as 9 and move on to Problem 2.
The statement of problem 1:
David has 14 lego blocks. Paul has 5 lego blocks. How many more lego blocks does David have than Paul?
Math ToolUnifix cubes, Colored stones
Math StrandArithmetic
Math ProblemWord problems with addition and subtraction
NCTM Grade RangePreK-2
NCTM Content StandardNumber and operations
NCTM Process StandardProblem solving, Reasoning and proof, Communication, Connections, Representation
Forms of Reasoning, Strategies and HeuristicsDirect reasoning, Guessing and checking
Grade Level1
Student ParticipantsStephanie (student), Sean (student), Gerardo (student), Aaron (student), Steven (student), Michelle D. (student)
MediatorsAlston, Alice S. (Researcher), Marinaro, Angela (Teacher)
CorporateHarding Elementary School (Kenilworth, N.J.)
SettingClassroom
Student GenderMixed
Student EthnicityMixed
Camera ViewsStudent 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.
Local IdentifierB30-ARTH-WRDP-CLIP001