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?
Topics: Starter  Arithmetic  Calculator  Decimals  Estimating  Games
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Previous Day  This starter is for 5 October  Next Day
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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=October5
Here is the URL which will take them to a similar number puzzle.