Each row of numbers is in a mathematical sequence.
Can you work out what the sequence is?
In the top left hand corner of the screen is a pile of numbers each of which completes a sequence.
Drag 4 or the 5 numbers into the spaces.
You can rearrange the order of the numbers at any time.
*Take care however!!! when you drag in your last number the rows becomes FROZEN.
To restart the activity just refresh the page.