I came across a pretty neat Montessori activity recently. The goal is to teach 1 to 1 Correspondence - a fundamental mathematical concept. Here's how it works: the child puts down all the cards and then places one included item on each card, teaching the child about one-to-one correspondence. Little Bear doesn't necessarily quite understand that when you count, you count one item at a time. So, this should be a helpful activity.
Here are some other inexpensive and easy Toddler Math Activities: http://www.monthome.com/maths.htm