An interesting expression of 18

1 02 2015

During the week I challenged my Year 12 Extension Mathematics class to use any operations they chose and all the digits of 2015 without repetition to make all the answers 1 through 20.
They were only allowed 2-3 minutes. 18 proved to be the challenge.
Most used only the basic operations for the other results.
I continued teaching and then heard “Got it”.
This was the result.





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