
You may use only these keys.
1 2 3 4 5 6 7 8 9 + =
Take turns to add a singledigit number to what is already on the calculator.
The winner is the player who makes the display show 30.
If you go over 30 you lose.
Topics: Starter  Arithmetic  Calculator  Games  Problem Solving
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Previous Day  This starter is for 14 November  Next Day
Teacher, do your students have
access to computers? 

Here is the URL for a concise version of this page without comments or answers.
Transum.org/go/?Start=November14
Here is the URL which will take them to Multipile Nim which is a different game but based on similar principles.
You might also like to try Simple Nim with pens and pencils.