How do I get a guy to ask for my number?

Recently I started talking with this guy at work but he left earlier than I did and the setting wasn't right for him to ask for my number (I suppose). I'm pretty sure he's interested in me because of the amount of time he spent talking to me and the interest he took in getting to know me. How do I subtly get him to ask for my number without seeming too forward or too eager?
How do I get a guy to ask for my number?
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