Your presenter today is:

Ihor Charischak

Council for Technology
in Math Education

"Come and hear some stories about unique and compelling ways that the Internet along with dynamic software such as Geometer's Sketchpad, Spreadsheets, Microworlds and Java applets can play a significant role in helping students gain a deeper understanding of powerful mathematical ideas." - Ihor

CIESEmath Activities

Wealth and Health of Nations
Hans Rosling

My Fractions Darts Story


Road Sign & Bus Problem
What's the problem with Word problems? At the heart of the problem is a very simple, yet powerful idea: making sense.

2 Fraction Darts

The object of the Fraction Darts challenge is to "pop" balloons located on a number line between 0 and 1. The darts are "thrown" by entering a number in fractional form.  Here is a glimpse of a game in progress. Two darts (7/8 and 3/4) have been thrown so far. Notice that 3/4 is too small and 7/8 is too big. What is your next throw? See also Decimal Darts

3 The Famous Jinx Puzzle
Pick a number,  Add 11, multiply by 6, subtract 3, divide by 3, Add 5, Divide by 2, Subtract the original number. Why is this called the Jinx puzzle?
Watch a Flash video of the proof.

4 The Noon Day Project:
Measuring the Circumference of the Earth

This activity recreates the experiment that Eratosthenes did 2200 years ago where he used shadow measurements to measure the circumference of the earth.

5 The Great Green Globs Contest

What is the highest score you can get with this array of Globs?