Monday Maths Madness 15

As it is Hallowe'en this Wednesday, I have some Hallowe'en themed maths madness! Muahahaha

This is probably the only kind of pumpkin pie I like...

More pumpkin pi! Apparently there aren't a lot of Hallowe'en maths jokes on the internet. In fact I could only find one other. This one seems really popular out on the web.

Why do mathematicians sometimes confuse Halloween and Christmas?
Because Oct 31 = Dec 25.

Basically counting to 31 using base 8 is the same as counting to 25 using base 10 (and yes I did just have to write out all the numbers to check I was explaining the joke right...). It just so happens that October 31st and December 25th are significant dates in the calendar. Spooky!

Happy Hallowe'en everyone! :)