We're all going on a . . . multiples hunt!

We have been exploring multiples of numbers by making our own multiples book to explore the 5, 10, 2 and even the 3 and 4 times tables and where they might be hiding in our hundred squares. It has been really fun! We have then been looking at the patterns we have made to give us clues as to what multiples a number could have.  If it ends in a 0 it has to be a multiple of 10 . . .
We then put lots of numbers around the classroom to see how we could use our books to help us with our multiples hunt.

Can anyone remember what a prime number is?