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md number operations and calculation methods

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Here is a chance to play a version of the classic Countdown Game.

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Interactive game. Set your own level of challenge, practise your table skills and beat your previous best score.

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Can you find a reliable strategy for choosing coordinates that will locate the robber in the minimum number of guesses?

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Can you find the values at the vertices when you know the values on the edges?

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Do you know a quick way to check if a number is a multiple of two? How about three, four or six?

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If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?

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Four friends must cross a bridge. How can they all cross it in just 17 minutes?