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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

Tangent Lines

Local linearity (Calculus) 
Computer 
Tool 

[0]

An animation of zooming in on the function f(x) = 5^x at x=0 until the function and its tangent line appear to coincide.
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Tangent Lines

Local linearity (Calculus) 
Flash 
Tool 

[0]

Animated description of a rigorous method to determine how accurate an approximation to a function the tangent line at a given point is.
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Linear Approximations

Local linearity (Calculus) 
JavaScript 
Tool 

[0]

Generate tables to compare the values of a function of the form f(x) = x^n and the approximation by a particular tangent line.
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Linear Approximations

Local linearity (Calculus) 
Java Applet 
Tool 

[0]

Investigate the error of various linear approximations to a function.
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Error Function

Local linearity (Calculus) 
Java Applet 
Tool 

[0]

Investigate the error function for different curves and different approximations to those curves.
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Linear Approximations

Local linearity (Calculus) 
Computer 
Tool 

[0]

RealMedia movies on derivatives as the best linear approximations to functions.
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Linear Approximations

Local linearity (Calculus) 
Java Applet 
Tool 

[0]

A Java applet that illustrates the use of the derivative in finding a linear approximation to a function, with questions to answer using the applet. Includes a rescalable presentation version with la...
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Box Volume

Local min / max (Algebra II)+ 
Sketchpad 
Tool 

[0]

Make an opentop box from a sheet of paper by cutting squares out of the corners. See how the volume of the box changes as the sides of the squares change. The link to the tool itself downloads the ...
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Evaluate Value of a Logarithmi...

Logarithmic Functions (Algebra II) 
Flash 
Support Material 

[0]

This minilesson explains how to estimate values of logarithmic expressions.
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Solving Assorted Equations usi...

Logarithmic Functions (Algebra II) 
Flash 
Support Material 

[0]

This minilesson explains how to use the laws of logarithms to simplify logarithmic equations and apply these in solving assorted word problems.
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Convert Logarithmic Expression...

Logarithmic Functions (Algebra II) 
Flash 
Support Material 

[0]

This minilesson explains a property of logs that lets you change bases by simple division.
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Is a Logarithmic Statement Som...

Logarithmic Functions (Algebra II) 
Flash 
Support Material 

[0]

This minilesson explains the process of using reasoning and logic to check whether an logarithmic statement is sometimes true, always true, or never true.
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Proof as Explanation: Distance...

Logic and proof (Geometry)+ 
Sketchpad 
Activity 

[0]

Students explore the sum of certain distances in an equilateral triangle, and develop a proof to explain their observations. The link to the activity itself is to a zip file that contains both the...
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Proof as Discovery: Kite Midpo...

Logic and proof (Geometry)+ 
Sketchpad 
Activity 

[0]

Students investigate and prove a property of kites, and use the proof to make a discovery about other quadrilaterals. The link to the activity itself is to a zip file that contains both the activi...
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Proof as Verification: Areas

Logic and proof (Geometry)+ 
Sketchpad 
Activity 

[0]

Students form a conjecture about the ratio of two areas in a quadrilateral, and use Sketchpad to search for a proof. In the process they verify or disprove their results for two different kinds of ...
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Ask Dr. Math FAQ: About Proofs

Logic and proof (Geometry) 
Computer 
Support Material 

[0]

Questions on "what is a proof?" answered by the math doctors of the Math Forum's Ask Dr. Math service.
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Disproving Statements (Geometr...

Logic and proof (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains, with the help of some examples, how to use logical reasoning to prove statements that are true and find counter examples to disprove statements that are false.
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Proof as Explanation: Distance...

Logic and proof (Geometry)+ 
Sketchpad 
Tool 

[0]

Students explore the sum of certain distances in an equilateral triangle, and develop a proof to explain their observations. The link to the tool itself is to a zip file that contains both the ske...
More: lessons, discussions, ratings, reviews,...

Proof as Discovery: Kite Midpo...

Logic and proof (Geometry)+ 
Sketchpad 
Tool 

[0]

Students investigate and prove a property of kites, and use the proof to make a discovery about other quadrilaterals. The link to the tool itself is to a zip file that contains both the sketch and...
More: lessons, discussions, ratings, reviews,...

Proof as Verification: Areas

Logic and proof (Geometry)+ 
Sketchpad 
Tool 

[0]

Students form a conjecture about the ratio of two areas in a quadrilateral, and use Sketchpad to search for a proof. In the process they verify or disprove their results for two different kinds of ...
More: lessons, discussions, ratings, reviews,...

Proof as Systematization: Tria...

Logic and proof (Geometry)+ 
Sketchpad 
Tool 

[0]

Students use Sketchpad to develop a proof for a result that was discovered and used (without proof) in an earlier activity. The link to the tool itself is to a zip file that contains both the sketc...
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Plexers for iPad

Logic and set theory (Math 5)+ 
iPad 
Tool 
$ 
[0]

If you like word puzzles, enjoy a good word game with friends, or can't wait for the Sunday paper with a new crossword puzzle, you'll enjoy this collection of word Plexers. Plexers are puzzles where c...
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Counterfeit Coins

Logic and set theory (Math 5)+ 
Java Applet 
Technology PoW 

[0]

Find the fewest number of weighings that will identify which of the nine coins is counterfeit. A link to a Java applet from The National Library of Virtual Manipulatives (NLVM) is provided to help stu...
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Monedas Falsas

Logic and set theory (Math 5)+ 
Java Applet 
Technology PoW 

[0]

Encuentre el número mínimo de monedas que pesaras para poder identificar cuál moneda de las 9 es falsa.
versión en inglés
NOTE: A free login is required. Sign up using th...
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Intenet Search and Set Operati...

Logic and set theory (Math 7)+ 
Calculator 
Support Material 

[0]

Introduction of elementary set operations through internet searching.
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