- 111,111,111

x

111,111,111

=

12,345,678,987,654,321. - If you have a pizza with radius Z and thickness A, its volume is =

Pi*Z*Z*A - 1089

x

9

=

9801. - 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.
- Students who chew gum have better math test scores than those who do not, a study found.
- 2,520 is the smallest number that can be exactly divided by all the numbers 1 to 10.
- 123 - 45 - 67 + 89 = 100.
- 123 + 4 - 5 + 67 - 89 = 100.
- 123 - 4 - 5 - 6 - 7 + 8 - 9 = 100.
- 1 + 23 - 4 + 5 + 6 + 78 - 9 = 100.
- There are 177,147 ways to tie a tie, according to mathematicians.
- In 1900, all the world's mathematical knowledge could be written in about 80 books; today it would fill more than 100,000 books.
- 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.
- Multiplying 21978 by 4 reverses the order of the numbers: 87912.
- Isaac Newton's Principia Mathematica contained a simple calculation error that went unnoticed for 300 years.
- 2200 years ago, Eratosthenes estimated the Earth's circumference using math, without ever leaving Egypt. He was remarkably accurate. Christopher Columbus later studied him.
- 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.
- 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.
- The largest prime number ever found is more than 22 million digits long.
- Multiplying 21,978 by 4 reverses the order of the numbers to 87,912.
- Newton invented/discovered calculus in about the same amount of time the average student learns it.