Back to school gift : perpetual calendar
Surprise! I saw a lot of these pairs of cube blocks calendars recently, and they made me wonder. It's a nice logical problem. To make a whole month, I need to be able to form numbers from 10 to 31 with two cubes, 12 faces. First I need numbers from 0 to 2 twice, to be able to do numbers like 31 or 10. It take 3 faces out of 6 on each cube. I will also need numbers from 3 to 9 to do all the other numbers. Which means it will take 7 faces more...
How is it possible then to do a perpetual calendar with only 2 cubes?
The solution is very simple. Did you guess?
I made my cubes with patterns and colors made to complement my little houses from my book "Mon village" but there is no obligation here...
Click on the picture to download the printable.
Personal use only.