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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Excellent, I would like to see more like this
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Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.2 out of 5 based on 268 votes.

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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...

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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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