In the back of your exercise book continue the following sequence of numbers as far as you can in four minutes.
1
4
9
16
25
...
It is your calculator's day off!
STOPWATCH 
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access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=August14
Here is the URL which will take them to another activity involving square numbers.
Transum.org/go/?to=Squareshoot