Calculator Nim





This is a game for two players:

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.


Share

Topics: Starter | Arithmetic | Calculator | Games | Problem Solving

  • Wikepedia,
  •  
  • Variants of Nim have been played since ancient times. The game is said to have originated in China (it closely resembles the Chinese game of Tsyanshidzi, or "picking stones"), but the origin is uncertain; the earliest European references to Nim are from the beginning of the 16th century. Its current name was coined by Charles L. Bouton of Harvard University, who also developed the complete theory of the game in 1901, but the origins of the name were never fully explained. The name is probably derived from German nimm! meaning "take!", or the obsolete English verb nim of the same meaning. Some people have noted that turning the word NIM upside-down and backwards results in WIN.

    Nim is usually played as a misère game, in which the player to take the last object loses. Nim can also be played as a normal play game, which means that the person who makes the last move (i.e., who takes the last object) wins. This is called normal play because most games follow this convention, even though Nim usually does not.
  • Aaron Joseph, Nlc
  •  
  • This game would be better if it was for one player. It is so easy. if you are player one you can always win. because the most ovibous one is 15 add 15 or 29 add 1 and 20 add 10. its just too easy
  • Josh, King's Gloucester
  •  
  • This is a great introduction to calculator work.

    You cannot just add 15 and 15 as the rules clearly state you can only add single digit numbers!
  • Jeff Locklier, Neerim District Secondary College
  •  
  • Perhaps some method of crossing out the numbers on screen as thety are used in the game.
  • Cameron, Y7
  •  
  • You can always win if you go 2nd because you can get to 10 and they cant beat you 5+5=10 if they choose any other number just make the number bonds to ten,. E.g 1+9, 3+7, 6+4 etc...
  • Transum,
  •  
  • Here is an idea for playing two person games like this with a class. Arrange the desks along three of the outside walls of the classroom in a sort of horseshoe shape. Pupils sit, two to a computer (laptop, iPad etc) to play the game. The teacher starts the game time and each pair plays one game then turns their chairs to face the teacher when they have finished. When everyone has finished the teacher instructs the pupils to move clockwise if they just won the game or anticlockwise if they lost. The pupils at either end of the horseshoe stay where they are. Repeat this many times. The pupils will move towards playing other pupils of similar insight into the strategies of the game and hopefully discover more about the number patterns involved. It is always, yes always in my experience, great fun for all involved.
  • Jake X, Scarborough, Canada
  •  
  • I should always want to be player 2. He/she has a winning strategy. Player one goes first, player two chooses in such a way that the result is 10 this is always possible. Now player one must go again. Starting with 10, the only result is 1119 so player 2 chooses so that his/her result is 20. Now player one is guaranteed to loose.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.1 out of 5 based on 325 votes.


Previous Day | This starter is for 14 November | Next Day

 

Answers


Extension

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.

Have you read Craig's book yet?

Craig Barton must surely be the voice of Mathematics teachers in the UK. His wonderful podcasts interviewing the industry experts have culminated in this wonderful book. As Craig says: "I genuinely believe I have never taught mathematics better, and my students have never learned more. I just wish I had known all of this twelve years ago..." more...

"How I wish I'd taught Maths" is an extraordinary and important book. Part guide to research, part memoir, part survival handbook, it’s a wonderfully accessible guide to the latest research on teaching mathematics, presented in a disarmingly honest and readable way. I know of no other book that presents as much usable research evidence on the dos and don’ts of mathematics teaching in such a clear and practical way. No matter how long you have been doing it, if you teach mathematics—from primary school to university—this book is for you." Dylan Wiliam, Emeritus Professor of Educational Assessment, UCL.

The Craig Barton Book

Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

Hello World

You are buying a (driverless) car. One vehicle is programmed to save as many lives as possible in a collision. Another promises to prioritize the lives of its passengers. Which do you choose?

Welcome to the age of the algorithm, the story of a not-too-distant future where machines rule supreme, making important decisions – in healthcare, transport, finance, security, what we watch, where we go even who we send to prison. So how much should we rely on them? What kind of future do we want?

Hannah Fry takes us on a tour of the good, the bad and the downright ugly of the algorithms that surround us. In Hello World she lifts the lid on their inner workings, demonstrates their power, exposes their limitations, and examines whether they really are an improvement on the humans they are replacing.

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

Online Maths Shop

Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

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 Multi-pile Nim which is a different game but based on similar principles.

Transum.org/go/?to=Nim

Student Activity

 

You might also like to try Simple Nim with pens and pencils.

 


Apple

©1997-2018 WWW.TRANSUM.ORG