Answer:
I am useless when together but useful when I am broken apart. What am I?
What has 3 feet but no toes?
Take away my first letter take away my second letter take away all my letters and I would remain the same.
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
You can never eat me for breakfast or lunch. What am I?
No matter how little or how much you use me, you change me every month.