Multiplying Two Whole Numbers In Batch

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I am trying to make a Shutdown dialogue in Batch and I have run into a slight problem. I don't like how Windows 8 asks you for the time in seconds when you would like to remote shutdown your own computer with a timer and I am trying to make a batch file that converts a given number (minutes) into seconds.

I have searched the vast majority of the interwebs and cannot find a way to multiply two whole numbers in a batch file.

Here is what I have so far:

@echo off  
echo Enter a number:  
set /p %num1%=  
echo Enter another:  
set /p %num2%=  
set /a sum1=%num1%*%num2%  
echo The total is %sum1%  
pause  

Could some kind soul please tell me where I have gone wrong?

Thanks Charlie B

3 Answers
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