Kids Riddles

Question: I am a nice word composed of five letters, but the Romans would call me a numbers.

What am I?

Question: How can you make 7 even?

Question: What is the easiest way to poke a balloon without popping it?

Question: My shallow hills are the faces of kings.
My horizon is always near.
My music sends men to the grave.
My absence sends men to work.

What am I?

Question: There are two boys at an international math contest in December 2013; one is British and one is American. They both write their names, the date, and their answers on the paper. The only problem is that they both have the same name and the papers cannot be told apart.

What is the date?