## 27 Interesting Facts About Mathematics

Did You Know?

1. Abacus is considered the origin of the calculator.

2. 12,345,678,987,654,321 is the product of 111,111,111 x 111,111,111. Notice the sequence of the numbers 1 to 9 And back to 1.

3. Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D.

4. An icosagon is a shape with 20 sides.

5. From 0 to 1,000, the letter “A” only appears in 1,000 (“one thousand”).

6. A‘jiffy’ is an actual unit of time for 1/100th of a second.

7. ‘FOUR’ is the only number in the English language that is spelt with the same number of letters as the number Itself

8. In a group of 23 people, at least two have the same birthday with the probability greater than ½ .

9. Among all shapes with the same perimeter a circle has the largest area.

10. Among all shapes with the same area circle has the shortest perimeter .

11. In 1995 in Taipei, citizens were allowed to remove ‘4’ from street numbers because it sounded like ‘death’ in Chinese. Many Chinese hospitals do not have a 4th floor.

12. The word “FRACTION” derives from the Latin “ fractio – to break”.

13. “Forty” is the only number that is spelt with letters arranged in alphabetical order.

14. Every odd number has an “e” in it.

15. Zero is not represented in Roman numerals.

16. -40 °C is equal to -40 °F.

17. The symbol for division (i.e.÷) is called an obelus.

18. A palindrome number is a number that reads the same forward and backward. For example, 34543.

19. Quadrillion, sextillion, quintillion, septillion, nonillion, octillion, decillion, and undecillion come after trillion.

20. The result of (6 x 9) + (6 + 9) is 69

21. There is no zero (0) in Roman numerals. The entire number system is generated by the seven different letters, namely I, V, X, L, C, D and M.

22. In the entire Hindu Arabic number system, there is only one number which can be spelled with the same number of letters as itself. That number is FOUR.

23. Forty is the only number that is spelt with letters arranged in alphabetical order.

24. One is the only number that is spelt with letters arranged in descending order.

25. The hour and minute hand of a clock coincide 22 times in a day.

26. 26 is the only natural number sandwiched between a perfect square number (25) and a perfect cube number (27).

27. We all have heard about the Pythagoras theorem. But there is also something which is known as Pythagoras constant. The square root of 2 i.e. 1.41 was the first irrational number to be discovered which is known as the Pythagoras constant.

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27 Interesting Facts About Mathematics

27 Interesting Facts About Mathematics