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PersonalNumber
Number and Operations

Personal Number

3-5, 6-8
Find your personal number using your birthday! It is the month + date + year & month × date × year.
IGDSimsonLineOrthocenter
Geometry

IGD: Simson Line - Orthocenter

9-12
Use this tool to explore how the Simson line of a triangle is related to the orthocenter.
IGDPerpendicularBisector
Geometry

IGD: Perpendicular Bisector

9-12
Use this tool to demonstrate how to draw a perpendicular bisector.
AngleBisector ICONn
Geometry

Angle Bisector

9-12

This interactive demonstrates how to bisect an angle.

AGeometricInvestigation
Algebra

A Geometric Investigation of (a + b)2

9-12
This interactive demonstrates why (a + b)2 = a2 +2ab + b2.
AlgebraTiles
Algebra

Algebra Tiles

6-8, 9-12
Use tiles to represent variables and constants, learn how to represent and solve algebra problem. Solve equations, substitute in variable expressions, and expand and factor.
IGDDroppingAPerpendicular
Geometry

IGD: Dropping a Perpendicular Line

9-12
Use this applet to show how to drop a perpendicular from a point onto a line.
PatchTool
Geometry

Patch Tool

Pre-K-2, 3-5
Use this tool to design a pattern using geometric shapes.
AreaOfTrapezoids
Geometry

Area of Trapezoids

6-8
Investigate how changes in the base and height of a trapezoid affect its area.
AreaOfParallelograms
Geometry

Area of Parallelograms

6-8
This applet shows the relationship between the area of a parallelogram and the lengths of its sides.
ProductGame
Number and Operations

Product Game

3-5, 6-8
This applet is the Product Game: a fun, interactive game that exercises your skill with factors and multiples.
IGDAreaOfARectangle
Geometry

IGD: Area of a Rectangle

3-5, 6-8
Use this tool to show how the side lengths of a rectangle affect the rectangle's area.
TriangleClassification
Geometry

Triangle Classification

9-12
Use this applet to show how the placement of the third vertex of a triangle affects the classification of that triangle.

Investigating Functions with a Ferris Wheel: Distance vs. Width

Investigating Functions with a Ferris Wheel: Distance vs. Width A Web Sketchpad activity helps students make sense of relationships between quantities, in this case the way that the distance a car travels around a Ferris wheel covaries with its "width" or horizontal distance from the center of the Ferris wheel

Investigating Functions with a Ferris Wheel: Distance vs. Height

Investigating Functions with a Ferris Wheel: Distance vs. Height A Web Sketchpad activity helps students make sense of relationships between quantities, in this case the way that the distance a car travels around a Ferris wheel covaries with its height. <iframe src="/tools/ferriswheel/FerrisWheel_

NameLetters
Algebra

Name Letters

3-5, 6-8, 9-12
Use this activity to practice solving systems of equations. Use this tool to check students' answers.
eEx_5.1 ICON
Number and Operations

5.1 Playing Fraction Track

3-5
Take timed turns racing to the end of each fraction line by moving one or more of your markers to sum to a given fraction value.
SimsonLine ICON
Geometry

Simson Line

9-12
This applet allows for the construction and exploration of the Simson Line.