I remember a game we would play in school that was sort of similar to this.
Someone would give a three digit number and 6 other number (usually four number between 1-9 and two higher number like 50 and 100.)
Then everyone else would have to use the six number to reach the three digit one using +, -, / and x. The first one to get the number won, or the one with the closes total.
For example 485 with 3, 4, 6, 9, 30, 100.
4*100 = 400
3*30 = 90
400 + 90 = 490
490 - 6 = 484.
I don't know how you guys feel about changing this game to that?