Digital Pizza
http://www.ecst.csuchico.edu/~pizza/pizzaweb.html

Create and "order" pizzas of different sizes with different toppings. By measuring the diameters of pizzas on the screen or on printouts and then computing areas (or using an overlay grid to measure area), learners can determine which size is the best buy (cost per square unit).

Lemonade Stand
http://www.littlejason.com/lemonade/index.html

An engaging simulation of a lemonade stand business. You must make business decisions about quantity of product to produce, price to charge, and other budgetary expenses. You have some constantoverhead costs and receive information on the daily weather forecast (probability). Endless possibilities for classroom numerical strategy discussions and modeling.

Wealth Accumulation Calculator
http://www.prusec.com/wlth_cal.htm

An online calculator that computes principle, time, rate of return, or total of principl+interest when other variables are entered. An excellent opportunity to look at consequences of a series of "What If"s. Once learners understand the concepts, using the calculator allows learners to see the long and short term impacts of changes in amount of money saved per month, different interest rates, and compounding frequency.

U.S. Census Bureau: Map Stats
http://www.census.gov/datamap/www/index.html

The U.S. Census Bureau's extensive database, accessible by state, Congressional district and county, of facts and figures about households and communities, including demographic information, budgetary information and housing information. This data can be used, for example, to compare communities' housing costs and demographic makeup, the industries found in different counties, or the percent growth or decline of population between census years.

Africanized Honey Bees
http://ag.arizona.edu/pubs/insects/ahb/

Africanized honey bees have moved into the Southwest and are here to stay. In addition to the safety issues that need to be addressed because of the defensiveness of these bees, honey bees are also fascinating subjects to study. These lesson plans were developed to familarize students with honey bees and bee safety issues through a variety of interesting activities.

Tech Prep Homepage
http://www.indiana.edu/~techprep/

This project is an outgrowth and expansion of the current Tech Prep Region 10 Mathematics Project . This ongoing project was designed to help high school Tech Prep mathematics teachers teach as suggested by Tech Prep and NCTM.

Pi Mathematics Homepage
http://www.ncsa.uiuc.edu/Edu/RSE/RSEorange/buttons.html

WELCOME to the Pi Mathematics Home Page. The concept of Pi, an irrational number, has been calculated and explored throughout history from biblical times to the present. Whether it is of historical significance, mathematical importance or a personal goal, Pi has universal appeal.

Interactive Mathematics Miscellany and Puzzles
http://www.cut-the-knot.com/

This site is was developed to help users get over math anxiety by using puzzles, games and brain teasers.

By the Numbers
http://kindermagic.com/BTN/BTNhome.html

It's the place to be for those interested in consumer mathematics: instructors, students, and consumers who wish to make informed financial decisions. Explore the activities, browse the bookstore, and follow the links to other worthwhile sites.