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Think about how you figure out a multiplication table, just with a piece of paper and a pencil. Then look at how the code does the same thing. Now think about how you would figure out an addition...

Well, you call a function that prints out the multiples, and it does exactly that. What did you expect to happen? Where is the code that's supposed to print out the addition table?

What exactly do you mean when you say you cannot seem to do it? What does it do instead? Have you tried stepping through this with a debugger, or at least a piece of paper and a pencil?