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*Guessing and checking*in Subject1

Date Created1990-10-11

DescriptionDuring this session, the students begin by working on the following problem: “Stephen has a white shirt, a blue shirt and a yellow shirt. He has a pair of blue jeans and a pair of white jeans. How...

2

Date Created1990-10-11

DescriptionIn this clip, researcher Amy Martino asks Dana and Stephanie to work on an extension to the shirts and pants problem: How many outfits can Stephen make if he has an additional pair of black jeans?...

3

Date Created1992-02-06

DescriptionIn this video, the fourth grade partners Romina and Brian are constructing a solution to the “Towers Problem 5-High.” PROBLEM STATEMENT: "Your group has two colors of Unifix® cubes. Work...

4

Date Created1989-03-21

DescriptionIn the fourth of nine clips in a first grade classroom, four children: Stephanie, Gerardo, Sean and Aaron, are working first on Problem 5 and then on Problem 6 of a set of six word problems involving...

5

Date Created1989-03-21

DescriptionIn the third of nine clips in a first grade classroom, four children: Stephanie, Gerardo, Sean and Aaron, are working first on Problem 3 and then on Problem 4 of a set of 6 word problems involving...

6

Date Created1989-03-21

DescriptionIn the second of nine clips in a first grade classroom, four children: Stephanie, Gerardo, Sean and Aaron, focus on the 2nd problem in a set of 6. After Stephanie reads the problem, the children use...

7

Date Created1989-03-21

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...

8

Date Created1989-03-21

DescriptionIn the second of three clips in a first grade classroom, Jeff, Milin and Jamie begin by reading problem 2. Jeff and Milin use Unifix cubes and Jamie counts out stones to model the problem. The two...

9

Date Created1989-03-21

DescriptionIn the last of three clips in a first grade classroom, Jeff, Milin and Jamie begin by reading problem 4. Jeff, without referring to the stones or cubes, immediately states that Grandpa would have six...

10

Date Created1989-03-21

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...