Replace the question mark with the correct number.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Imagine you are in a room with no windows or doors. How will you get out?

81 x 9 = 801. What must you do to make the this equation true?

Which is the smallest number that you can write using all the vowels exactly once?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

How do you go from 98 to 720 using just one letter?

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

Do you know what I am?

What does the below image rebus riddle means ?