# Web Links for Pre-Algebra, 2nd. ed.

About Links## Section 3.1 Equations

- Illuminations: Everything Balances Out in the End; Lesson 1—Develop an understanding of solving equations and the properties of equality using shapes and a pan balance

## Chapter 4 Number Theory Opener

- Illuminations: Code Crackers—Investigate the coding and decoding of messages using the Caesar substitution cipher

## Chapter 5 Math and Scripture

- Does the Bible say pi equals 3.0?—Provides possible explanations for a biblical reference that seemingly indicates that the value of pi is 3

## Section 6.5 Simplifying Algebraic Expressions

- Illuminations: Everything Balances Out in the End; Lesson 2—Uses concrete balances to help students understand simplifying algebraic expressions

## Section 7.1 Forms of Percents

- Illuminations: Fraction Model III—Interactive illustration of fractional, decimal, and percent equivalents

## Section 7.4 Scales

- Illuminations: Scaling Away—Scaling activity worksheets and assessment methods

## Section 7.7 Interest

- Illuminations: Compound Interest Simulator—investigate savings account, credit card, and stock market applications

## Chapter 8 Applying Equations and Inequalities Opener

- National Weather Data Lesson —Directs students to find patterns in real-time weather data

## Section 8.2 Variables on Both Sides

- Illuminations: Exploring Equations—Concrete exploration of solving equations

## Section 9.4 Graphing Linear Functions

- Illuminations: Exploring Linear Data—Students model linear data and write equations of best fit

## Section 10.1 Statistical Measures

- Virtual Statistics Lab—A variety of statistical instruction, simulations, case studies, and analytical tools

## Section 10.2 Diagramming Data

- Illuminations: Using NBA Statistics for Box and Whisker Plots—Outlines an activity is which students make and compare box and whisker plots using data from a professional sports league

## Section 10.3 Histograms

- Illuminations: Exploring Histograms—Provides an interactive histogram tool

## Section 10.4 Graphing Data

- Illuminations: Finding our Top Speed Outlines—An activity in which students use bar graphs to describing data

## Section 12.1 Basic Geometric Figures

## Section 12.3 Polygons

- Illuminations: Squares, Diagonals, and Square Roots—Examine the relationship between the lengths of a square’s sides and diagonals.
- Illuminations: Exploring Angle Sums—An interactive exploration of the sum of a polygon’s angle measures

## Section 12.4 Perimeter and Circumference

- Illuminations: The Ratio of Circumference to Diameter—Discover the formula for the circumference of a circle

## Chapter 12 Math in Use M. C. Escher

- Tessellation Tutorials—Contains many links allowing students to make their own tessellations in a variety of programs

## Section 12.8 Symmetry and Transformations

- Illuminations: Shape Cutter—Decompose and recompose shapes and perform slides, turns, and flips in a virtual manipulative environment

## Section 13.1 Area of Parallelograms

- Illuminations: Areas in Geometry—Explore the areas of rectangles, parallelograms and triangles
- Illuminations: Area Formulas—Four lessons developing area formula of foundational geometric figures

## Section 13.5 Surface Area

- Illuminations: Finding Surface Area and Volume—Allows students to build three-dimensional figures to study surface area and volume

## Section 13.6 Surface Area of Pyramids, Cones and Spheres

- Polyhedra Nets by Math Forum @ Drexel—Provides nets and outlines an activity in which students make models of polyhedra

- Apostle Paul’s Shipwreck—A historical examination with helpful maps

## Appendix F Divisibility by Seven

- Divisibility Rules by Math Forum @ Drexel—Lists divisibility rules for 2 through 13 and links to explanations and a divisibility test for numbers through fifty

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