
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
If the target was 53 instead of 30 what strategy could you use to win?
Investigate for other targets and different available calculator keys.
Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
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.