Maybe something from our CafePress store would suit you?
This High-Precision JavaScript Calculator performs the basic mathematical functions (+, -, *, DIV, MOD) on fairly large numbers. It can also calculate the GCD and LCM, as well as a couple of other number theory things. It's useful for a variety of functions where precision is absolutely required. Click on the "Help..." button for more information regarding this Calculator.
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Maybe something from our CafePress store would suit you?