Simple but effective resource - please rate! Three versions of connect-4 to encourage students to interact: 1) with percentages on the virtual board, where students convert them to decimals (or fractions); 2) with a random number generator and different rounding methods, where students try to round to the correct degree of accuracy; 3) create your own by adding a file named input.txt in the same folder with the desired text for the virtual connect four board. The coloured counter is placed if you pick a colour and click on the desired part of the board.

Clicking on each number takes out factors until all the numbers are prime

A short flash animation demonstrating how to bisect an angle with compasses. Can be played on the whiteboard to show each step clearly.