Can you move 2 matchsticks to form four equal sized squares.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Replace the question mark with the correct number in below Picture:

How can you make number one disappear by adding something to it?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What does this simple rebus mean?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Can you find the 09 errors in the picture below?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?