Presented by:

Ihor Charischak

CLIME-Council for
Technology in
Math Education

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CMDB75 Activities
Version 2 in the works -
You can help!

Below are some highlights:

Mind Reader

Great Green Globs

Stock Market Game

Great sources for
Microworld-like Activities

NCTM's Illuminations

Calculation Nation

Library of Virtual


Scratch math projects

Ihor's scratch

1 Family Fractions
It's time for all fractions to return to their home pad. Keep clicking on the cards until none of them move.
Scratch app:
Weird Number -

Draws different Spirolaterals. See if you can predict what kind will come up based on the three numbers. There are three types of spirolaterals - Gloop, Whimsy, and Wumpus. Can you separate them into these groups according to number?
Scratch app:

Billiard Paths (Paper Pool)
Here you will find an unusual billiard table. The dimensions are determined by the numbers on the sliders. Your Challenge: See if you can come up with a way to predict (1) what the number of touches will be for any given size billiard table and (2) which corner the ball will end up in.
Scratch app:
tracking sheet:

Is this a Fair Game? Rolling Dice 1, 2 and 3
Scratch app 1:

Scratch app 2:

Scratch app 3:

4 Slope
A much simpler version of Green Globs. The object is to get the highest score with the least number of lines drawn. Scoring is as follow: 1 pt for 1 glob; 2 pts for the 2nd glob; 4 pts for the 3rd glob; 8 pts for the 4th and 16 pts for the 5th glob. All you do is enter the slope number (m) and the y-intercept (b) and the line gets drawn hopefully through many globs.
Scratch app:

5 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?

Scratch app:

6 Power Cards - A mathematical puzzle
Pick a number from 1 to 31. Watch the computer figure what number you chose through the magic of binary numbers.

Scratch app:

7 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 (5/8 and 3/4) have been thrown so far. Notice that 3/4 is too small and 7/8 is too big. (See also Decimal Darts)
Watch these 5th graders play Darts with a Smartboard. [link]

Fractions in Number Town & Elizabeth, NJ & Number Town Applet

Scratch app: