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|Highscores (61 registered players)|
|1||Arturo||100%||0:11.3 min.||23 Apr, '11|
|2||Drew06||100%||0:12.0 min.||23 Oct, '09|
|3||Veejay||100%||0:12.1 min.||8 Apr, '08|
|4||toffetom||100%||0:12.4 min.||22 Oct, '09|
|5||Nynke88||100%||0:12.6 min.||26 Oct, '09|
|6||SharifProvoste||100%||0:12.9 min.||24 Apr, '11|
|7||ally||100%||0:12.9 min.||19 Dec, '08|
|8||MisterSamsonite||100%||0:13.1 min.||1 Sep, '07|
This is an online quiz called Math Clock: Double Factorial
There is a printable worksheet available for download here so you can take the quiz with pen and paper.
Find the double factorial of each numeral. The double factorial is like the factorial but omits odd numbers from even factorials and the reverse. So 5!! is 5x3x1; and 6!! is 6x4x2.
The basic image is made freely available by GTCO Calcom
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