This is a game for two players. Let's call them A and B.

A begins by typing any number into a calculator.

B then multiplies this number by another number, trying to get the answer as close as possible to 100.

A then multiplies this number by another number, trying to get even closer to 100.

The winner is the first player to make the total equal a hundred point something.

Play the game many times. Can you find a good strategy for winning?



A Transum Maths Starter Of The Day



Topics: Starter | Arithmetic | Calculator | Decimals | Estimating | Games

  • Nikki, Devon
  • Excellent. A great reminder for kids who have just been investigating what happens when you multiply or divide a number by a value between 0 and 1. Thanks
  • Transum,
  • This is starter for two students working together. There is a lot to be gained from pupils collaborating on problem solving as they not only learn from their partner but also benefit from practising putting their thoughts into words so their partner can follow their line of reasoning. Technically this starter puts one pupil in competition against the other but all of the other Starters of the Day can be presented in a 'working together' format either in pairs or small groups.
  • Matthew Zhao, 4AD, Craigslea State School
  • A great mental teaser to let me think about a great way of a never-ending game. Just simply have Player A enter 0 into the calculator, then nobody can ever win because 0x(any number) will always be 0!

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This starter has scored a mean of 3.1 out of 5 based on 451 votes.

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Texas Instruments Nspire Calculator

This handheld device and companion software are designed to generate opportunities for classroom exploration and to promote greater understanding of core concepts in the mathematics and science classroom. TI-Nspire technology has been developed through sound classroom research which shows that "linked multiple representation are crucial in development of conceptual understanding and it is feasible only through use of a technology such as TI-Nspire, which provides simultaneous, dynamically linked representations of graphs, equations, data, and verbal explanations, such that a change in one representation is immediately reflected in the others.

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Apple iPad Pro

The 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.

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Before giving an iPad as a Christmas gift you could add a link to iPad Maths to the home screen.

Click the images above to see all the details of these items and to buy them online.

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.

Here is the URL which will take them to a related student activity.

Student Activity


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