
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.
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Apple iPad ProThe analytics show that more and more people are accessing Transum Mathematics via an iPad as it is so portable and responsive. The iPad has so many other uses in addition to solving Transum's puzzles and challenges and it would make an excellent gift for anyone. The redesigned Retina display is as stunning to look at as it is to touch. It all comes with iOS, the world's most advanced mobile operating system. iPad Pro. Everything you want modern computing to be. more... Before giving an iPad as a Christmas gift you could add a link to iPad Maths to the home screen. 
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.