Good Riddles

Question: If 1+9+8=1, what is 2+8+9?

Question: I tear paper but I'm not mad,
I wear a purse but it's not a fad.

Who am I?

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

What am I?

Question: No matter how much rain comes down on it it won't get any wetter.

What is it?

Question: I can run but never walk. Wherever I go, thought are close behind me.

What am I?