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Dave
February 11, 2009, 03:54 AM
The digits in all multiples of 9 will add to 9.

9 x 3 = 27. 2+7 = 9 :eek:
joey
February 11, 2009, 04:14 AM
9 x fined = things can only improve.
joey
February 11, 2009, 04:16 AM
http://www.marriedtothesea.com/032906/calculus.gif
Dave
February 11, 2009, 07:00 AM
Subtract a number from it's "opposite", the number with the digits reversed, and the result will be a multiple of 9.
Not Right in the Head
February 11, 2009, 04:30 PM
The digits in all multiples of 9 will add to 9.

9 x 3 = 27. 2+7 = 9 :eek:

Same goes for 3. But not 6.
Not Right in the Head
February 11, 2009, 04:32 PM
If you want to know how long it will take an investment with a constant interest rate to double, divide 72 by the interest rate to get the number of years. In other words, a 6% savings rate will double your investment in 12 years.
PregnantForTheLastTime
February 11, 2009, 04:53 PM
There are investments with constant interest rates? Please show me the way... I've been cut in half.
Corrissey
February 11, 2009, 11:08 PM
My birthdate reads the same right side up as it does upside down.

I'm cool like that. :cool:
snowfallsoon
February 12, 2009, 03:13 AM
You use the 'rule of nines' to assess the size of a burn
Buzzetta
February 12, 2009, 03:24 AM
The month and day that I am born adds up to 9
The six digit representation of the year I was born when added up is divisible by 3