
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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If the target was 53 instead of 30 what strategy could you use to win?
Investigate for other targets and different available calculator keys.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=November14 However it would be better to assign one of the student interactive activities below. 

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.