I'm going to make a set for each kid, and I'll add the "+", "-" and "=" to my daughter's set since she is really into math lately.
I tried doing the numbers in white but then tried the black and liked it much better.
The kids loved the beanbags and came up with all sorts of games. They matched them to flashcards, threw them at each other while yelling the number, etc. Not quite sure what was going on with the hula-hoop here but they had a blast and asked that I please make them more.