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Making change Brainteaser

by David Shaw, 3 October 2018 | 3 comments

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Australia has six coins that are commonly used – 5 cents, 10 cents, 20 cents, 50 cents, $1 and $2. How many different ways can you make exactly 50 cents in Australian coins?

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Thirteen cent coins Activity

by David Shaw, 2 May 2017 | 0 comments

small circles of paper with the numbers 1, 2, 5, 13, 29 and 64 written on them.

You’re probably familiar with 20 cent and 50 cent coins. But different countries have different values for their coins. So what’s the best way to number coins?

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Double Helix

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