Triple Nine Wall Clock – a Timely Student Math Challenge for Clockwatchers
Here’s a neat challenge for your students: Ask them to find a way to represent each of the positive integers from 1 through 12 using exactly three 9′s. This puzzle is a variation of the Four 4′s puzzle: Write each of the positive integers using exactly four 4′s. Some sample answers include the following. 1 [...]
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