I'm made some excel files that create unique math worksheets using random numbers and look-up for randomized words. You can see, use and download the files from [url]http://www.educationalsynthesis.org/teachers[/url]/ .... in the Math section, click on Numbers, Add and Subtract, Multiply and Divide, and Word Problems. You will have to have excel running on the computer you are using to open the files. Once open, you can choose the activity from the tabs at the bottom on the worksheets. Print a copy of the page, then click on the F9 key (dunno what Mac users do), to update all the numbers. Print again and you have another unique math page for your students. Print out a unique page for each student (for no-cheat tests) or copy for a class set. The answer key is at the bottom of most pages, which can be detached before giving it to the student.
These files are used for my whole math curriculum for six home school students each working on different levels. These kids are super honest and use the answer key at the bottom to check their work before turning it in. With less honest kids, you can either bend the answer key back, or tear it off.
If anyone else find these useful, please let me know. I'm thinking of doing a conference presentation of these files in the Spring, and could use some input on what's hard or easy about using them.