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### 5.1.1 Playing Fraction Tracks

3-5

Think about how fractions are related to a unit whole, compare fractional parts of a whole, and find equivalent fractions.### 5.1.2 The Role of the Teacher

3-5

Two video clips illustrate communication about mathematics among a teacher and her students.### 5.1.3 Communication among Students

3-5

Use communication as a tool to deepen their understanding of mathematics.### 5.1.4 Reflecting on Practice

3-5

The teacher reflects on her own mathematical learning.### 5.2.1 Distance, Speed, and Time Relationships Using Simulation Software

3-5

Use a software to simulate two runners along a track.### 5.3.1 Exploring Properties of Rectangles and Parallelograms Using Dynamic Software

3-5

Explore geometric relationships and make and test conjectures.### 6.1.1 Learning about Multiplication Using Dynamic Sketches of an Area Model

6-8

Visualize the effects of multiplying a fixed positive number by positive numbers greater than 1 and less than 1.### 6.2.1 Constant Cost Per Minute

6-8

Explore the total cost when the cost per minute for phone use remains constant over time.### 6.2.2 Changing Cost per Minute

6-8

Explore the total cost when the cost per minute for phone use changes after the first sixty minutes of call.### 6.3.1 Side Length and Area of Similar Figures

6-8

Learn about how the side lengths, perimeters,
and areas of the two similar rectangles are related.