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Word problems with addition and subtraction, Jeff's group, Clip 1 of 3: Introduction and problem 1, how many more legos does David have than John? [video]. Retrieved from https://doi.org/doi:10.7282/T3X0650T

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TitleWord problems with addition and subtraction, Jeff's group, Clip 1 of 3: Introduction and problem 1, how many more legos does David have than John?
PublisherNew Brunswick, NJ: Robert B. Davis Institute for Learning, 1989-03-21, c1989-03-21
Persistent URLhttps://doi.org/doi:10.7282/T3X0650T
DescriptionIn the first of three clips in a first grade classroom, teacher Angela Marinaro introduces the day's activity and distributes a packet of problems to each child. She first asks the students to identify the materials that they have on their tables. After the children show Ms. Marinaro their Unifix cubes and stones, she directs each group to read and solve problem 1. Jeff reads the problem at his table and the three children immediately model the two numbers. The two boys assert that the answer is nine, while Jamie contends that David has eight more legos than Paul. As the children recount and still insist on their two different answers, Ms. Marinaro joins the group. She listens to their solutions and askes them to compare their models. When there is still disagreement, she asks Jamie to explain the model that she has constructed from stones. After a first count of eight, the teacher asks Jamie to align the two sets of stones, first counting off pairs to match Paul's five legos with the first five of David, and then carefully counting the remainder. Jamie does this and agrees that there are nine.
Statement of problem one:
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 ParticipantsJeff (student), Milin (student), Jamie (student), Brian (Kenilworth, student)
MediatorsMarinaro, 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.
Date Captured1989-03-21
Local IdentifierB31-ARTH-WRDP-CLIP001