If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

What can go up a chimney down, but can’t go down a chimney up?

What makes this number unique: 8,549,176,320?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

what's the probability of getting a king or a queen from a pack of 52 cards?

Be active and find the killer in the picture Riddle below.

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

There was a strange boy who was born before his father. How can this be possible?

Why is 6 afraid of 7?