This activity was so much fun that after the first class did it I brought my camera in to the second class to snap some photos of it.
Here's how it goes:
I split the class into two teams and distribute big pieces of paper with the numbers 0-9 (plus some duplicates just in case) to each team.
Then, I read questions which have numbers for answers. The first team to hold up the correct numbers in the right order gets a point!
Here's what it looks like: