You may use only these keys.
1 2 3 4 5 6 7 8 9 + =
Take turns to add a single-digit 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.
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If the target was 53 instead of 30 what strategy could you use to win?
Investigate for other targets and different available calculator keys.
Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to Multi-pile Nim which is a different game but based on similar principles.
You might also like to try Simple Nim with pens and pencils.