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111,111,111

x

111,111,111

=

12,345,678,987,654,321.

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

Pi*Z*Z*A

1089

x

9

=

9801.

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.

Newton invented/discovered calculus in about the same amount of time the average student learns it.