Check out this link I found on Pinterest:
Printable scrabble tiles
You could practice basic numeracy skills or even pose averages questions like find me a five letter word with a range of 3 and a median of 2 (QUOTH, 41132 is one possible solution).
BH sent me a brilliant link to this addictive website:
Visualising Primes
It could be used to discuss factors, multiples and primes. Or even just let it run in the background on a projector.
This is a great BBC documentary hosted by Terry Jones (Monty Python) about the history of the western number system:
The Story of One
