Triple Nine Wall Clock – a Timely Student Math Challenge for Clockwatchers

By Bill Lombard on 2 January, 2009

triple nine wall clock 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 = (4+4)/(4+4)

2 = 4/4 + 4/4

3 = (4+4+4)/4

This clock can actually be found online for purchase at cafepress.

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mr ls cursive signature Triple Nine Wall Clock a Timely Student Math Challenge for Clockwatchers

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2 responses to “Triple Nine Wall Clock – a Timely Student Math Challenge for Clockwatchers”

  1. Anonymous
    Anonymous 6 January, 2009 at 5:03 pm |

    Answers! I need answers

  2. blombard
    blombard 6 January, 2009 at 5:11 pm |

    Hello Anonymous,
    My students are hard at work on this problem, which has turned into a clock-making project due next Monday the 12th. I will be posting their solutions at that time.
    Good luck until then.
    - Mr. L

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