## A Date of Good Luck

Today is 11/7/13, which is a semi-lucky/lucky/unlucky date.

The numbers in today’s date are 7, 11, and 13, which are the same numbers used in my favorite math trick. I shared that trick on 7/11/13 in A Great Day for a Math Trick — which, honestly, was the best day ever to share it (unless you’re in Europe, in which case today is perfect). For U.S. audiences today, do the division by 11 before the division by 7:

1. Multiply your age by 12.
3. This should yield a three-digit number. Now, divide by 11.
4. Then, divide by 7.
5. Then, divide by 13.
6. The result should be a number of the form 0.abcdef…, with a 0 and a decimal point in front of a long string of digits. Add the first six digits after the decimal point.

Here’s the cool part. I don’t know your age, nor do I know the age of your spouse, brother, sister, friend, uncle, or aunt. But I do know that after you completed those steps, this is your result.

Now, how did I know that?

That’s for you to figure out.

Math Major: I’ve found that 67% of Literature majors are stupid.
Literature Major: I’m part of the other 13%.

I was walking past a mental hospital the other day, and all the patients were shouting, “13… 13… 13… 13.” The fence was very high, so I peeked through a little gap in the planks to see what was going on.
Some bastard poked me in the eye with a stick.
Then they all started shouting, “14… 14… 14… 14.”

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The Math Jokes 4 Mathy Folks blog is an online extension to the book Math Jokes 4 Mathy Folks. The blog contains jokes submitted by readers, new jokes discovered by the author, details about speaking appearances and workshops, and other random bits of information that might be interesting to the strange folks who like math jokes.

## MJ4MF (offline version)

Math Jokes 4 Mathy Folks is available from Amazon, Borders, Barnes & Noble, NCTM, Robert D. Reed Publishers, and other purveyors of exceptional literature.