Some mathematical clocks where the numbers from 1 to 12 are written in an original way.

You can print and use the clock dials. Take the challenge and make your own mathematical clock!

See also the article in Plus Magazine and some notes.

With basic arithmetic operations, and the floor and ceiling functions.

(Download the PDF.)

With basic arithmetic operations only.

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Only the prime numbers are displayed.

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The dot stands for '1', the bar stands for '5'.

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Only the digits 1,2, and 3 are used (exactly once and in this order). With the factorial and the floor function.

With some inspiration from As easy as 1-2-3.

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Only the digit 3 is used, and exactly 3 times. With the factorial, and a repeating decimal.

With some inspiration from Immer drei mal drei.

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**The e-clock.**Based on the Euler's number e.

(Download the PDF.)**The 1-clock.**Based on the number 1.

(Download the PDF.)**The 2-clock.**Based on the number 2.

(Download the PDF.)**The 3-clock.**Based on the number 3.

(Download the PDF.)**The 4-clock.**Based on the number 4.

(Download the PDF.)**The 5-clock.**Based on the number 5.

(Download the PDF.)**The 6-clock.**Based on the number 6.

(Download the PDF.)**The 7-clock.**Based on the number 7.

(Download the PDF.)**The 8-clock.**Based on the number 8.

(Download the PDF.)**The 9-clock.**Based on the number 9.

(Download the PDF.)