The most common way I've seen is to have a slide where you have the additional information. It can be phone numbers, email address, websites, books, anything you want to refer to.
People tend to photograph these slides so make sure the information is error free and that you add you own marketing info to the slide as well.
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It changes a little depending on what programming language you're using, but in C you could say
int times_ten (int num) {
num = num*10;
return num;
}
Or, in general terms:
Integer Function times_ten (Integer num)
Set num = num * 10
Return num
This is all done assuming the number used as an argument is an integer and that you are returning an integer value, not a decimal. The main thing to notice is that since you have to return a value, you must have two things: a return statement, and a type declaration for the function, otherwise you'll get an error.
