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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Teacher, do your students have
access to computers?
Here is the URL for a concise version of this page without comments or answers.
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.