What are some fun math and number facts?

 Amazing facts about Maths?

According to this mathematical fact, from 0 to 1000, the only number that has the letter 'A' in its spelling is 1000.

Every odd number contains the letter E.

Zero is the only number not depicted in Roman numerals.

Try doing this: Multiply 6 with an even number. Do you get an answer that ends with the same digit?

When spelled (FORTY) has its letters arranged in alphabetical order.