Make your own calculator.

MAKE A CALCULATOR USING BATCH FILE

----------------------------code------------------------------
echo off
cls
echo.
echo This is multiplication calculation
set/p "user=FirstNo=>"
set/p "pass=SecondNo=>"
set /a a=%user%*%pass%
echo so the answers is = %a%
pause >nul
---------------------------end code---------------------------

paste the copied code in your notepad and save as "calculator.bat" or any other name with bat extension
you can change * with +,- and / to perform various operations

Cool find, I am learning quite a bit from being at this forum...
You know what I'd do? I'd create a batch that opens a shortcut to MS Calculator.