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Reasoning
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1.

## Pumpkin Seeds [electronic resource]

A grade 1-2 class, working in groups, develops their sense of larger numbers by estimating and counting the number of seeds in pumpkins. Covers the following NCTM standards: number sense and numeration, estimation, communication, and reasoning.
Online
1997
2.

## Animals in Yellowstone [electronic resource]

Fourth- and fifth-graders develop number sense and meaning for large numbers by estimating how many bison, elk, and pronghorn they saw on a field trip to Yellowstone National Park. Students debate and justify their estimates verbally and in writing. Covers the following NCTM standards: number sense and numeration, estimation, problem solving, and connections.
Online
1997
3.

## Reasoning [electronic resource]

Includes 16 classroom excerpts from the content standards lessons which illustrate the central role of reasoning in mathematics. As students explain and justify their thinking and solutions throughout the excerpts, teachers emphasize that how a problem is solved is as important as its answer.
Online
1997
4.

## Connections [electronic resource]

In excerpts from eight classrooms, students make connections within mathematics, to other disciplines, and to situations in the real world.
Online
1996
5.

## What Does It Mean to Measure? [electronic resource]

Explores what can be measured and what it means to measure. Identifies measurable properties such as weight, surface area, and volume, and discusses which metric units are more appropriate for measuring these properties. Defines use of precision instruments, and presents alternate methods such as displacement. Examines approximation techniques and how to make better approximations using reasoning skills.
Online
2002
6.

## Rational Numbers and Proportional Reasoning [electronic resource]

Begins examining rational numbers and explores a model for computations with fractions. Analyzes proportional reasoning and the difference between absolute and relative thinking. Presents ways to represent proportional relationships and the resulting operations with ratios. Illustrates how ratios can represent either part-part or part-whole comparisons, depending on how you define the unit and explores how this affects their behavior in computations.
Online
2003