What belongs only to you, and yet is used more by others than by yourself?

How many times can you subtract 10 from 100?

It is always pronounced wrong, even by scholars and even by teachers. What is it?

The man who makes me doesn’t use me. The man who buys me doesn’t need me. The man who uses me doesn’t know that he is using me. What am I?

How many circles are there in the picture?

I'm as big as an elephant but lighter than a feather. What am I?

I am an odd number. If you take away one letter from me, I become even. Who am I?

Fred’s parents have four sons. They are Spring, Summer, and Autumn. What is the fourth son’s name?

Can you remove two matchsticks to make below equation correct?

Tom and his younger sister were fighting. Their mother was tired of the fighting and decided to punish them by making them stand on the same piece of newspaper in such a way that they couldn't touch each other. How did she accomplish this?

Can you find THE HIDDEN TIGER?

Connect all the dots with 6 (joint) line segments without lifting your pen off the paper.