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

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

A father's child, a mother's child, yet no one's son.

Who am I?

Replace the question mark with the number below given a simple math problem.

What can jump higher than a building?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Too much grey makes things difficult. However, your task here is to find the elephant hidden in the picture.

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?