1. 111,111,111
    x
    111,111,111
    =
    12,345,678,987,654,321.
  2. If you have a pizza with radius Z and thickness A, its volume is =
    Pi*Z*Z*A
  3. 1089
    x
    9
    =
    9801.
  4. Ancient Babylonians did math in base 60 instead of base 10. That's why we have 60 seconds in a minute and 360 degrees in a circle.
  5. Students who chew gum have better math test scores than those who do not, a study found.
  6. 2,520 is the smallest number that can be exactly divided by all the numbers 1 to 10.
  7. 123 - 45 - 67 + 89 = 100.
  8. 123 + 4 - 5 + 67 - 89 = 100.
  9. 123 - 4 - 5 - 6 - 7 + 8 - 9 = 100.
  10. 1 + 23 - 4 + 5 + 6 + 78 - 9 = 100.
  11. There are 177,147 ways to tie a tie, according to mathematicians.
  12. In 1900, all the world's mathematical knowledge could be written in about 80 books; today it would fill more than 100,000 books.
  13. The birthday paradox says that in a group of just 23 people, there's a 50% chance that at least two will have the same birthday.
  14. Multiplying 21978 by 4 reverses the order of the numbers: 87912.
  15. Isaac Newton's Principia Mathematica contained a simple calculation error that went unnoticed for 300 years.
  16. 2200 years ago, Eratosthenes estimated the Earth's circumference using math, without ever leaving Egypt. He was remarkably accurate. Christopher Columbus later studied him.
  17. Mathematician Paul Erdos could calculate in his head, given a person's age, how many seconds they had lived, when he was just 4 years old.
  18. In middle school, 74% of girls express interest in Science, Technology, Engineering and Math, but when choosing a college major, just 0.4% of high school girls select computer science.
  19. The largest prime number ever found is more than 22 million digits long.
  20. The discoveries of Greek mathematicians such as Pythagoras, Euclid, and Archimedes, are still used in mathematical teaching today.
  21. Multiplying 21,978 by 4 reverses the order of the numbers to 87,912.
  22. 1 divided by 998001 gives a complete sequence from 000 to 999 in order.
  23. 2,520 is the smallest number that can be exactly divided by all the numbers 1 to 10.
  24. Arabic numerals, like the ones we use today in English, were actually invented in India.
  25. The Millennium Prize is a US$1 million award given to whoever can solve any 1 of 7 math problems, but to date only 1 of the problems has been solved.
  26. Newton invented/discovered calculus in about the same amount of time the average student learns it.
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