Here are links to some online tools which will allow you to practice basic numerical manipulations to your heart's content. The options available so far:
These pages have been designed to fit properly on 14-inch (and larger) monitors; laptop users may or may not be able to see all of the necessary information.
The underlying routines were written using Netscape's version of JavaScript, so if Internet Explorer users encounter problems, first make sure that you're using the latest version of that browser, then (if that doesn't help) try it with Netscape -- say, at the computer center. Whether or not this solves the problem, please tell me about it, as I may be able to fix things on my end.
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Tools for Practicing Numerical Skills
Written by Chris Magri
URL: http://academic.umf.maine.edu/~magri/tools/