The word hundred is derived from the word "hundrath", which actually means 120 and not 100.

mshch

Hundrath is Old Norse.

 111,111,111 × 111,111,111 = 12,345,678,987,654,321.

Via studentbeans.com

It also works for smaller numbers: 111 × 111 = 12321.

 In a room of just 23 people there’s a 50% chance that two people have the same birthday.

DimitrovoPhtography/DimitrovoPhtography

It's called the Birthday Problem. In a room of 75 there's a 99% chance of two people matching.

 Zero is the only number that can't be represented in Roman numerals.

Flickr: wwarby / Creative Commons

The Latin word "nulla" would have been used instead.

 (6 × 9) + (6 + 9) = 69.

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