We played a very fun game called Countdown. A link to an online version, and the rules are listed at the bottom.
This game definitely made us feel like a failure and that we were facing an impossible task at first, but by the second round we figured out our individual weaknesses and strengths and were more focused and DRIVEN to get as close to the number or the number itself. It was a highly rewarding experience because by the end each of us were able to drastically improve the way we solved the problem. Our blood was definitely pumping at the end of practice with exhilaration.
Rules: Select 6 numbers (at least one large number) from the cards. A number is then randomly generated. Set a time (we did 4 mins) and have each person try to get the actual number or as close to it as possible. Use the 6 numbers in any combination of addition, subtraction, multiplication, and division. For example, you cannot square one of the numbers. Here's one of our problems that stuck in my brain:
The 6 numbers are: 90, 10, 7, 1, 5, 3
Generated number: 836
90 x 10 = 900 900-836 = 64 so if we can find a way to make 64 from our
7+1 = 8 remaining numbers we can simply do 900-64 = 836. We
5+3 = 8 found a way to make two 8's to make 64. Bang on target!
8 x 8 = 64