Fun Riddles

Question: A man finds a small iron coin dated 154 B.C., what's it worth?

Question: If you look at my face there won't be 13 any place.

Question: When is homework not homework?

Question: Little Johnny is walking home. He has $300 he has to bring home to his mom. While he is walking a man stops him and gives him a chance to double his money. The man says "I'll give you $600 if you can roll 1 die and get a 4 or above, you can roll 2 dice and get a 5 or 6 on at least one of them, or you can roll 3 dice and get a 6 on at least on die. If you don't I get your $300."

What does Johnny do to have the best chance of getting home with the money?

Question: If you aim to give us a shot, we'll riddle you.

What are we?