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Algebra

4.1 Creating, Describing, and Analyzing Patterns

Pre-K-2
Encourage students to use visualization, spatial reasoning, and geometric modeling to build their own patterns or recreate one from given square arrays.
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Data Analysis and Probability

4.6.1 Estimating Scoops

Pre-K-2
Present an estimation task and reflect on teaching decisions.
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Data Analysis and Probability

4.6.3 Estimating Cranberries

Pre-K-2
Estimate the number of cranberries rather than the number of scoops.
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Number and Operations

5.1.2 The Role of the Teacher

3-5
Two video clips illustrate communication about mathematics among a teacher and her students.
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5.1.3 Communication among Students

3-5
Use communication as a tool to deepen their understanding of mathematics.
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5.1.4 Reflecting on Practice

3-5
The teacher reflects on her own mathematical learning.
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Geometry

Area of Rectangles

3-5

This applet allows for the exploration of the area of rectangles.
 

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Geometry

Area of Triangles

3-5, 6-8

To find the area of a triangle, try to make a parallelogram using a copy of the triangle.

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Data Analysis and Probability

Handshakes

3-5, 6-8

When the nine justices of the Supreme Court meet, they greet one another with a handshake to show harmony of purpose, even though their views may differ. How many handshakes occur? In general, how many handshakes occur when there are n people?

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Number and Operations

Bunny Times

Pre-K-2, 3-5

Become confident in facts up to 12 x 12 using visual models that stress the conceptual aspects of multiplication.