### Number

Number Pyramids (addition puzzles)

Signed Number Arithmetic games

Number Puzzles

Percent

Powers (pre-algebra)

Powers (basic algebra)

All three units are related to each other.

They are based on Chapter 8 ofAlgebra: Themes, Tools, Concepts, lessons 5 to 11.

This unit is based onAlgebra: Themes, Tools, Concepts, lessons 7.9-7.11

This unit is based onAlgebra: Themes, Tools, Concepts, lessons 8.11-8.12

This unit includes material fromAlgebra: Themes, Tools, Concepts, lesson 9.8

Dot Paper

### Algebra

Functions, Teacher Notes

Dot Papers | GeoGebra files

Proportional Relationships (a subset ofFunctions, slightly edited)

Linear Functions

Make These Designs

Left or Right?

This unit is based onAlgebra: Themes, Tools, Concepts, lessons 7.2 and 13.1-13.3

This unit is based onAlgebra: Themes, Tools, Concepts, Chapter 10

Graph Paper

See also: Off and On / Add Till It's Plaid

Systems of Linear Inequalities

The Lab Gear (manipulatives for algebra)

The blocks, and two books (pre-algebra and algebra) are available from Didax.

### Geometry

Introduction to pentominoes, area and perimeter (7th grade)

Geometry Labs, 4.1

Working with Pentominoes, select from pp. 4-16

Congruence (7th grade)

Working with Pentominoes, pp. 32-33

Geometry Labs, 6.1

This unit includes material fromGeometry Labs(1.1, 1.2, 1.5, 1.7)

Circle geoboard paper

Geometric Construction for Middle School

(using compass, straightedge, patty paper, and GeoGebra)

Introduction using GeoGebra | Triangle paper

One-inch graph paper

This unit references lessons fromWorking with Pentominoes.

It also includes material fromAlgebra: Themes, Tools, Concepts, lesson 6.11.

Introduction using GeoGebra

### Teaching

Homework and Assessment suggestions

Nothing Works (presentation on "how to teach")

More about teaching

Tim Erickson's materials on modeling, sampling, area, and volume can be found on his site.