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

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

What does the below rebus riddle means?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Solve below rebus puzzle?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?