Groovy kid's addition test generator

One of my munchkins started doing weekly math speed tests at school, where they have 2 minutes to try to answer 40 addition questions. To make practice more fun, I bought a great little ipad app called MathBoard. The app really is nice, but it's still not the same as pencil and paper, so I looked online for a way to generate the tests that I could print. I waded through about a dozen of them, and they all failed for one reason or another - wouldn't do 40 questions, poorly formatted, include extra garbage, don't print on one page, etc... So I spent a few minutes and created this little groovy script:

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