A desk calendar can be made using two cubes to show the day of the month.
What numbers would be on the faces of the cubes so that each date from 1 to 31 can be displayed?
Topics: Starter  Problem Solving  Puzzles
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Use the printable net above to make your orn cube calendar. A cassette case (Are you old enough to remember those?) makes an excellent stand for your cubes.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=December30 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a different type of calendar net.
Transum.org/Software/Fun_Maths/Calendar.asp
Here is the URL which will take them to a calendar investigation.
Hint: For those of you who do not have a Transum subscription you might be interested to know that the solution to this puzzle involves using a font such that the six, when turned updide down, can also be used as a nine!