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Power Countdown

Age 14 to 16
Challenge Level Yellow star
Secondary curriculum
  • Problem
  • Getting Started
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Power Countdown printable sheet


In the game of Power Countdown, you use a set of numbers to make a target number, but unlike the usual Countdown game where you can use $+, -, \times$ or $\div$, the only operations you can use are raising a number to a power, taking the reciprocal of a number, or finding the product of two numbers.

Each number can only be used once. You don't have to use all the numbers. There is often more than one way of making a particular target, so see how many different ways you can find.

Watch the video to see some examples.

Can you find any other ways of making $8$?
Are there any ways which use all the numbers?

Here is another selection.

Countdown: 2,4,5,25,27,81, target 125
How many ways are there to make the target number of $125$?


Below is a selection of numbers and five targets.
Numbers 2,5,16,243,343,512

Targets: 49,89,1024,216,64
How many different ways can you find to make each target?

Are there any targets you can't make? How close can you get?
 

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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