What is the common multiples of 5 and 10?

Oh, dude, common multiples of 5 and 10 are just numbers that both 5 and 10 can divide evenly into. So, like, the common multiples of 5 and 10 would be 10, 20, 30, 40, and so on. It's like when two friends agree on what movie to watch - they both like it, so it's a common choice.