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### Interactive

Title | Brief Description | Category | Date |

Display a number of statistics about the text you enter, including word, letter, and sentence counts. | Communication | 8/16/2017 | |

Find out just how likely it is that two or more random Birthdays are found on the same day. | Data Analysis and Probability | 9/9/2016 | |

Find Sin, Cos, Tan, Cosec, Sec, and Cotan for any angle on the unit circle. | Geometry | 6/18/2014 | |

Shoot random points at a circle to approximate the value of Pi. | Geometry | 6/16/2014 | |

Generate the best fit of a line. | Data Analysis and Probability | 6/10/2014 | |

Draw a polygon and then count the sum of its angles. | Geometry | 6/4/2014 | |

Estimate Pi by calculating the geometrical probability of a needle landing on a line. | Data Analysis and Probability | 5/28/2014 | |

Applet that demonstrates foldings a piece of paper into a cylinder. | Geometry | 4/3/2009 | |

Use this applet to explore some issues related to generation, demand, and transmission of electricity. | Electricity, Electricity | 4/8/2008 | |

A prime number calculator that can handle numbers up to 16 digits long | Number & Operations | 9/19/2007 | |

A collection of Java Sketches created in Geometer's Sketchpad and saved as Java Applets | Geometry, CTM 2007 | 2/26/2007 | |

Learn about how the power grid functions by managing electricity generation and distribution. | Electricity, Electricity | 6/10/2006 | |

Review or practice resource for students struggling with significant figures. | Significant Figures & Measurement | 2/23/2006 | |

The periodic table is emptied and users have to put the elements back in their correct location. | Periodic Table | 1/1/2006 | |

The names of the elements are available in spanish, german, and english on this site. | Periodic Table | 1/1/2006 | |

Brief clip reviews atomic numbers and metallic trends in the periodic table. | Periodic Table | 1/1/2006 | |

Ten periodic table activities and a printer-friendly periodic table are available on this site. | Periodic Table | 1/1/2006 | |

Video Stream from Harvard covering periodic trends. | Periodic Table | 1/1/2006 | |

Convert numbers from one base to another. | Number & Operations | 12/16/2005 | |

Learn about probability and hidden states with the MiSTEam | Data Analysis and Probability | 11/14/2005 | |

Ask Nick to take a random step while he braves the edge of a cliff. | Algebra, Connections Conference 2006, Communication, Number & Operations, Data Analysis and Probability | 11/3/2005 | |

Graph points in the plane | Connections Conference 2006, Geometry | 11/1/2005 | |

A virtual scratch card with user-defined properties. | Data Analysis and Probability | 4/20/2005 | |

An in-class guessing game of numbers. | Significant Figures & Measurement | 2/23/2005 | |

Basic information on the characteristics of the elements, table is color coded by type of element (example: noble gasses). | Periodic Table | 1/1/2005 | |

Highly visual informational website. Includes information about elemental properties and products the elements can be found in. | Periodic Table | 1/1/2005 | |

Fold this piece of paper into a three dimensional pyramid. | Connections Conference 2006, Geometry | 7/29/2004 | |

Learn to count in binary, including signed notation and adding 2 binary numbers. | Number & Operations | 7/24/2004 | |

Graph a wide range of functions in 3 dimensions. (requires Java3D download) | Geometry | 6/17/2004 | |

Easy to read periodic table outlining the electron configurations. | Periodic Table | 1/29/2004 | |

Try to get the same sum along rows, columns, and diagonals of a matrix of numbers. | Problem Solving | 1/22/2004 | |

Challenges students to fill in a blank periodic table. | Periodic Table | 1/1/2004 | |

Pick your favorite door and play the game of chance with Monty. | Data Analysis and Probability | 9/23/2003 | |

Create shapes with a virtual Geoboard. | Geometry | 9/21/2003 | |

Find shape weights using a balance. | Algebra | 9/21/2003 | |

Explore the Pythagorean Theorem through regular polygons and circles on the sides of a right triangle. | Geometry | 9/18/2003 | |

Introductory resource including atomic structure definitions, abbreviations, and itmes in the news. | Periodic Table | 1/1/2003 | |

Explore geometry first-hand using toothpicks. | Problem Solving | 11/15/2002 | |

Plot points and see their line of best fit. | Algebra | 9/19/2002 | |

Remove your chips with rolls of the dice. | Data Analysis and Probability | 9/19/2002 | |

Demonstrate the probability of two randomly chosen integers being relatively prime. | Number & Operations | 3/25/2002 | |

Learn about inscribing a regular polygon in a circle. | Geometry | 2/26/2002 | |

Race cars by rolling a die. | Data Analysis and Probability | 1/28/2002 | |

Visual database of physical and thermochemical properties, two games and a feature showing the table in the year of your choice | Periodic Table | 1/1/2002 | |

Learn about the relationship between a polygon's inner angle and its number of sides. | Geometry | 11/29/2001 | |

Explore acid-base titration in this chemistry lab experiment. | Chemistry, Problem Solving | 11/3/2001 | |

Produce up to 500 non-trivial Pythagorean Triples. | Geometry | 10/22/2001 | |

See how addition and subtraction work. | Number & Operations | 9/10/2001 | |

Fold this piece of paper into a three dimensional box. | Geometry, CTM 2007, Connections Conference 2006 | 8/3/2001 | |

Study the relationships between perimeter, area, length, and width of a rectangle. | Algebra | 6/12/2001 | |

Evaluate arithmetic expressions step-by-step. | Algebra | 5/4/2001 | |

Plot points on a graph and then fit the data with a polynomial of a chosen degree. | Data Analysis and Probability | 4/8/2001 | |

Illustrates the effect of a given matrix on the unit circle. | Geometry | 3/5/2001 | |

Plot the graph for Ax=b and check out the graphical effects of precision. | Algebra | 1/30/2001 | |

Brief tutorial with basic notes and eleven questions. | Significant Figures & Measurement | 11/25/2000 | |

Explore the quadratic formula and a variation of it. | Algebra | 10/13/2000 | |

Sum a divergent infinite series. | Algebra | 9/13/2000 | |

Arrange the toothpicks to form five squares. | Problem Solving | 9/11/2000 | |

Approximate the surface area for the Earth if its radius changed. | Geometry | 8/20/2000 | |

Compare rounding and truncation. | Number & Operations | 8/16/2000 | |

Create fancy parabolas using Java Sketchpad. | Algebra | 8/16/2000 | |

Adjust the precision on this web calculator. | Number & Operations | 8/16/2000 | |

Track the spread of a disease among hermits using this interactive Java applet | Data Analysis and Probability | 6/15/2000 | |

A javascript applet for calculating BMI. | Number & Operations | 5/18/2000 | |

Approximate numerical integration. | Algebra | 5/16/2000 | |

Explore addition using visual representation rather than just an abstract concept. | Number & Operations | 4/20/2000 | |

Fill a rectangular box with cubes. | Geometry | 4/20/2000 | |

Approximate the area of a circle using a grid. | Geometry | 4/1/2000 | |

Play with the perimeter of boxes. | Geometry | 3/27/2000 | |

Online random flash card generator for simple math operations. | Number & Operations | 3/8/2000 | |

Create and graphically visualize a floating point system. | Number & Operations | 3/8/2000 | |

Plug in your favorite coefficient matrix and solve it. | Algebra | 3/7/2000 | |

Compare how well four methods of root estimation rank up with each other. | Algebra | 2/11/2000 | |

An exploration of the effect of voltage on current | Physics | 1/19/2000 | |

An exploration of the resistance | Physics | 1/19/2000 | |

Explore how water pressure influences the rate at which water flows out of a water tower and why small towns need water towers. | Physics | 1/19/2000 | |

Explore the flow of electrons in circuits. | Algebra | 1/19/2000 | |

See how water pressure influences the rate at which water flows out of a picnic cooler | Physics | 1/19/2000 | |

Explore triangles using Java Sketchpad | Geometry | 1/17/2000 | |

Quick reference quide to the numbers of the periodic table. | Periodic Table | 1/1/2000 | |

Find the Chi-squared value of drawing a number of random marbles. | Data Analysis and Probability | 12/8/1999 | |

View Autocad files made by TCD students. | Geometry | 12/7/1999 | |

Use a spreadsheet with a few basic operations. | Communication | 9/3/1999 | |

Launch a rocket if it passes all stages of its flight tests. | Data Analysis and Probability | 8/8/1999 | |

Practice identifying significant figures using flashcards. | Significant Figures & Measurement | 7/28/1999 | |

Practice identifying significant figures using flashcards. | Significant Figures & Measurement | 7/1/1999 | |

Imulation of acid-base titration with pH curves (for high school students) | Titrations | 5/22/1999 | |

Move the pieces of a puzzle around to form an egg. | Problem Solving | 3/20/1999 | |

This Java applet simulates a motion detector. Move the man and see a graph of his motion. | Measurement, Connections, Connections Conference 2006 | 2/17/1999 | |

This page offers statistical programs that can be downloaded directly into the TI-82 or 83. | Data Analysis and Probability | 2/2/1999 | |

This site offers a few interactive javascripts to explore mathematics. There are Calculators, Converters and Solvers. | Algebra | 1/8/1999 | |

Do a simulation of a shot from the free throw line. | Representation | 12/15/1998 | |

Track the distance the two fish move from each other. | Measurement | 10/1/1998 | |

Discover the temperature at any point on a metal plate. | Algebra | 8/7/1998 | |

Toss these digital dice and see what numbers roll up. | Data Analysis and Probability | 6/16/1998 | |

Includes excellent photos of the each element and interesting environmental/health related information. | Periodic Table | 1/1/1998 | |

A Game that introduces probability from Hands-on to Resampling Stats | Data Analysis and Probability | 7/16/1997 | |

Dazzle your students with this so-cool animated introductory exercise | Geometry | 10/22/1996 | |

A Java-based, online version of the Elements | Geometry | 4/7/1996 | |

Excellent table manipulation feature, allowing students to view table trends one characteristic at a time. | Periodic Table | 1/1/1996 | |

Exploring equations for lines, parabolas, and tangents using Geometer's Sketchpad | Algebra | 10/22/1995 | |

An informational webpage covering the background and properties of the elements of the periodic table. | Periodic Table | 1/1/1993 |

### Lessons

Title | Brief Description | Category | Date |
---|---|---|---|

Enter Tesla Town and explore electricity generation and delivery. |
Electricity Electricity |
11/2/2012 | |

Explore power and energy usage in the home, taking into account time of use pricing. |
Electricity Electricity |
4/8/2008 | |

This applet simulates a system that is owned by a power utility company. |
Electricity Electricity |
9/6/2007 | |

Explore power and energy usage in the home. |
Electricity Electricity |
6/10/2006 | |

Complete HCl titration lesson. |
Titrations |
5/22/2006 | |

Walks through the titration process using plastic bottles rather than burets. |
Titrations |
5/22/2006 | |

Lab outline including materials and procedures. |
Titrations |
5/22/2006 | |

Lab, questions, and vocabulary based on a titration experiment. |
Titrations |
5/22/2006 | |

In this experiment, students will analyze a number of commercial products. |
Titrations |
5/22/2006 | |

Two separate redox titrations using a standardized permanganate solution. |
Titrations |
5/22/2006 | |

Analysis of a commercial product and use of back titration. |
Titrations |
5/22/2006 | |

In this laboratory exercise you will attempt to determine the number of acidic hydrogen's in a weak organic acid (HnA) by monito |
Titrations |
5/22/2006 | |

Complete Aspirin titration lesson. |
Titrations |
5/8/2006 | |

Nice, basic pictoral walk through of titration techniques |
Titrations |
4/11/2006 | |

Three period lesson using both classroom and internet activities. |
Significant Figures & Measurement |
2/23/2006 | |

Descriptive outline of a lab report, specifying how to enter information. |
Lab Reports |
2/23/2006 | |

Basic notes on the topic |
Significant Figures & Measurement |
2/23/2006 | |

A lesson to accompany the "Folding a Rectangular Prism" applet |
Representation Number & Operations Problem Solving Geometry Measurement Algebra |
1/1/2006 | |

Includes both notes and activites, lots of opportunities to practice. |
Significant Figures & Measurement |
2/23/2005 | |

Control an Environmental Scanning Electron Microscope to image insects at high magnification. |
Problem Solving |
2/10/2005 | |

Students actively discover characteristics and the patterns in the periodic table. |
Periodic Table |
1/1/2005 | |

Each group must find a creative way to describe the family characteristics to the class. |
Periodic Table |
11/19/2003 | |

Extensive notes followed by 8 practice exercises make this excellent for assessment of understanding. |
Periodic Table |
1/1/2002 | |

A scientific paper reflecting upon and making a new suggestion for student lab reports. |
Lab Reports |
12/1/2001 | |

Roll dice and see the relationship between sides of a triangle. |
Geometry |
7/3/2001 | |

This tool seems very effective for teaching Geometry at remotely located students. |
Geometry |
5/30/2001 | |

Extensive listing of educational java modules in computational science. |
Communication |
4/9/2001 | |

Geometrically show the differences between 2 squares. a*a -b*b=(a-b)(a-b)*(a+b)(a+b) |
Geometry |
2/10/2001 | |

Web-centered framework for education and outreach in the Mississippi River Basin and other prominent |
Communication |
1/19/2001 | |

Computational chemistry simulations and visualizations for use in the chemistry classroom |
Chemistry |
1/19/2001 | |

Modeling And Simulation Tools for Education Reform |
Communication |
1/19/2001 | |

This page is designed to help students develop their ability to recognize graphs of functions. |
Algebra |
5/18/2000 | |

An Introductory Project in Trigonometry using The Geometer's Sketchpad |
Geometry |
2/9/2000 | |

This unit consists of interactive web activities and lesson plans for the traditional classroom. |
Periodic Table |
1/1/2000 | |

This unit includes an essay, "scavenger hunt," and web activity with extra lessons on electrons and shape of the periodic table. |
Periodic Table |
1/1/2000 | |

This unit consists of interactive web activities and lesson plans for the traditional classroom. |
Periodic Table |
1/1/2000 | |

Use multicolor index cards to recreate the periodic table. |
Periodic Table |
9/14/1999 | |

Provides students with an opportunity to discover scientific facts about an element(s) and express what they have learned. |
Periodic Table |
9/14/1999 | |

Use multicolor index cards to recreate the periodic table. |
Periodic Table |
9/14/1999 | |

A basic lab outline. |
Lab Reports |
7/28/1999 | |

This is a spreadsheet that models the vertical motion of two water balloons being dropped |
Problem Solving |
7/20/1999 | |

This lesson deals with proportions, right triangles and the geometric mean |
Geometry |
3/22/1999 | |

This page offers a Java Program to Generate Pythagorean Triples. |
Geometry |
2/3/1999 | |

This lesson provides numerous mathematics explorations in terms of missing calcualtor keys. |
Problem Solving |
1/20/1999 | |

This activity includes an Excel file and a Java fileto experiment with interactive triangles. |
Geometry |
12/30/1998 | |

This lesson/unit allows an exploration into the ratio that designates a cancerous cell. |
Geometry Problem Solving Problem Solving Geometry |
12/22/1998 | |

Directions and descriptions for creating and simulating the creation of a parabola. |
Algebra |
12/22/1998 | |

How many marbles will the pyramid have, if there are ten flights? |
Number & Operations |
12/14/1998 | |

Use Excel to help students better understand Euclids Algorithm, Herons Algorithm, and the Estimation of pi. |
Number & Operations |
12/11/1998 | |

Find the maximum number of cars passing a point in a given amount of timeusing algebra |
Algebra |
12/10/1998 | |

Lesson to introduce students both to Mathematica and to the Monte Carlo method of solving probability problems |
Data Analysis and Probability |
10/21/1997 | |

A lesson that uses many options for studying tesselations |
Geometry |
10/21/1997 | |

A great way to set up activities for holding a multicultural math fair in your school! |
Communication |
10/21/1997 | |

Learn about magic squares and their origin. |
Problem Solving |
10/21/1997 | |

Unit designed to teach surface area and volume |
Geometry |
10/21/1997 | |

A two day unit plan that incorporates decision-making ideas from statistics into the science classroom. |
Data Analysis and Probability |
10/21/1997 | |

This web page contains nine lessons that use the TI-92 and nine programs for the TI-92. |
Data Analysis and Probability |
7/20/1997 | |

Students will reinforce their knowledge of fractions by using online pattern block activities. |
Number & Operations |
7/20/1997 | |

Introduction to Descriptive Statistics with Mode, Median, Mean, and Range |
Data Analysis and Probability |
7/16/1997 | |

Students will explain their Chi-square test, calculations, and conclusion of results. |
Reasoning and Proof |
7/16/1997 | |

This lesson places mathematics in the real-world context of cartography. |
Representation |
1/14/1997 | |

A Fractals Lesson for Elementary and Middle School Students |
Geometry |
7/9/1996 | |

Find the temperature at a particularpoint of a rectangular plate using statistical methods. |
Geometry |
6/30/1996 | |

Use Geometer's SketchPad to give a graphical introducation to variance and covariance. |
Algebra |
5/21/1996 | |

Students explore notions of relationshipsbetween two variables. |
Algebra |
5/17/1996 | |

Student activities to explore the concept of expected value |
Data Analysis and Probability |
5/6/1996 | |

This lesson tracks the spread of a disease on a desert island inhabited by hermits. |
Data Analysis and Probability |
5/6/1996 | |

Introduction to measure of central tendency and variation. |
Data Analysis and Probability |
4/5/1996 | |

Understand statistical terms such as expectation, significance, and chi-square |
Data Analysis and Probability |
4/5/1996 | |

This lesson explores the process of finding the best fittingexponential curve to sets of data. |
Algebra |
2/22/1996 | |

Your task is to match up the correlation coefficients with the plots. |
Data Analysis and Probability |
2/21/1996 | |

Learn all about fractals. |
Geometry |
1/19/1996 | |

Enjoyable activities involving geometric transformations and image distortion. |
Geometry |
10/29/1995 | |

Supplementary material to help students with their first encounter with vectors. |
Geometry |
10/22/1995 | |

Illustrates the intuitive notion of the tangent plane to a graph of a function of two variables. |
Geometry |
10/22/1995 | |

Use the stock market to calculate commissions and costs for buying and selling stock. |
Data Analysis and Probability |
10/2/1995 | |

An integrated weather unit for students in grades four through six. |
Representation |
10/2/1995 |