Mental Math and "Around the World"

First of all, Blogger notified me yesterday that I've reached my limit on photos! 1 GB! But, I was able to buy more space (20 GB) for $5 a year. I'm just waiting for it to get 'approved.'

I was searching for some Mental Math worksheets that I've used at a co-op before... and I found them here!  They have daily sheets for 1st through 8th grade. Here are some samples from 5th grade:

100 X 10 = ?
How many feet in a mile?
1/3 of 30 = ?
1/4 of 28 = ?
70 X 80 = ?

In our co-op, I will use these to play Around the World. To play around the world, you have 2 students stand up. You ask one of the questions, and whoever gets it wrong sits down. The winner moves and stands next to another student who then stands up. You ask another question and the 'loser' sits down while the 'winner' moves on. The winner must win against every other student in the class! I know my last co-op class enjoyed this game, and I hope this one does, too!