A Clock for Math Whizzes

Now this is a clock for math whizzes! The clock sports math equations involving the number 9 and is made by the Triple Nine Society, a high-IQ organization:

Each number is expressed as a calculation involving three instances of the number 9.

For example, 5 o'clock is the square root of nine (3), factorial (3x2x1 = 6), minus 9/9 (6-1 = 5).

The trickiest time is 7 o'clock, whose calculation works out to 6.99999..., with an infinite number of nines. Wikipedia assures us that 0.99999... really does equal 1, so no worries that the clock is cheating there.

Link - Thanks bactac!

Newest 5
Newest 5 Comments

Why do you need Wikipedia to tell you that .999(9) is equal to 1? The proof is three lines long:

Let S = 0.999(9)
Then 10*S = 9.999(9)
10*S - S = 9 --> 9S = 9 --> S = 1

Abusive comment hidden. (Show it anyway.)
Math "whiz"? Yeah, figuring out the square root of 9 is pretty challenging.

I'd say it's geeky and suitable for a math teacher's classroom, but not quite "whiz level". It's probably beyond about the top 5% of U.S. government school teenagers, though. Cute.
Abusive comment hidden. (Show it anyway.)
Login to comment.

Email This Post to a Friend
"A Clock for Math Whizzes"

Separate multiple emails with a comma. Limit 5.


Success! Your email has been sent!

close window

This website uses cookies.

This website uses cookies to improve user experience. By using this website you consent to all cookies in accordance with our Privacy Policy.

I agree
Learn More