Mad Minutes

I am currently grading an Algebra Review quiz that I gave my Geometry students. It floors me how many students miss problems due to integer arthimetic errors. So I've decided to do "mad minutes" in Alg 2 next year. I don't know how many of you remember Mad Minutes from gradeschool, but I'm bringing them back heheh... Here's a link to an Excel document that creates these... Mr. Beach's Spreadsheet

However, how do I grade them? I guess I need to reach out to some elementary buddies and ask them :) I'm thinking maybe some kind of team competition where the prizes are based on most improved team and highest scoring team per quarter.

Ideas welcome!