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

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Solve this riddle by finding the odd one out from the rest.

Move three sticks of the spiral below to form a square.

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

I am the fastest animal but cannot climb the tree. What am I?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?