What does this mathematical rebus means ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Identify the hidden meaning behind this picture?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you find out the remainder when 3^300 is divided by 5?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?