Hi J.,
Our entire family LOVES the game Wits and Wagers, from my (at the time we got it) 8 year old stepson, all the way up to my 85 year old grandma. It's kind of a trivia game, but all of the answers are numeric. Everyone writes their answers on mini dry erase boards, and then you line them all up in ascending order on a "betting table," and then each player gets 2 chips to place on the answer(s) that they think are most likely correct. The person who wrote down the answer that is closest to the actual answer (without going over) wins chips, and all the people who bet on that answer also win chips. So, even if you don't write down the correct answer initially , you can still win.
I am certainly not doing it justice, but check it out; it's so much fun!