One Player Game Fill the game board with the counters from both boxes. Avoid lining up four numbers with a common factor (other than one). A trophy is available for filling all the cells of the game board. Two Player Game Each player has a box of counters to choose from. Take it in turns to drop a counter into the game board. The winner is the first to line up four numbers with a common factor (other than one).

Drag the counters into the area above the game board then release.

Here are examples of four numbers that have a common factor:

15,10,20,20 - Common factor 5

8,4,20,24 - Common factor 4

21,18,15,24 - Common factor 3

You can earn a Transum virtual trophy for completing the one-player challenge.

Transum,

Saturday, August 09, 2014

"I have seen too many students that, while understanding the algebraic concept of factorisation, can not easily spot the common numerical factors. Hopefully this game might help improve common factor spotting ability."

Jess, England

Monday, May 02, 2016

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