No matter how little or how much you use me, you change me every month. I’m full of numbers, but I’m not used for math. What am I?

I run all around the pasture, stretching far and wide, yet I never take a single step. I surround what I protect and keep everything in its place. What am I?

You answer me, although I never ask you questions. I can ring, but I never speak. I connect people from afar, yet I never move. What am I?

If you drop me, I’m sure to crack. Give me a smile, and I’ll always smile back. I’m often found in the same place, waiting to see you. What am I?

I am a word of six; my first three letters refer to an automobile; my last three letters refer to a household animal; my first four letters is a fish; my whole is found in your room. What am I?

I have branches that stretch far and wide, yet I bear no fruit. I have no trunk or leaves to be found, yet people depend on me every day. What am I?

They come out at night without being called, and are lost in the day without being stolen. What are they?

Mr. and Mrs. Mustard have six daughters, and each daughter has one brother. How many people are in the Mustard family?

What has a head, a tail, is brown, and has no legs?

Two mothers and two daughters go shopping. They have $21, which they split equally between them. How can this be possible?