On Wed, 15 Sep 2004, Devin Weaver wrote: > I am an Emergency Medical Technician. One of the valuable piece of > information is a persons date of birth coincided with there age. I always > hated asking people what there age was. So I thought I could figure it out > from there date of birth. Or if the patients are unconscious I could get > there divers license. > > The problem was I can't do that kind of math in my head nor can I carry a > calculator around. > > I found Chisenbop saves me time and mental energy here is the process I > use to quickly grab an age. This first technique is fast and will narrow > down the age with in a year. The second technique takes the first and > narrows down the age exactly. > > One. Get the year the patient was born (For example 1942) > > Now place your hands all extended to represent 99. Now remove fingers > corresponding to the two significant digits of the year. So pull back 4 > fingers from the left hand and two from the right hand (This leave a > representation of 57) > > Since the current year is 2004 we count / add four to the right finger > carrying as described in Chisenbop. Leaving a result of 61. > > This is either there exact age or is one year less then there exact age. > > Two. The exact age can be determined by looking at the day and month of > there date of birth. if there birthday has passed this year then add on to > the count of four above. For example if the date of birth is January > first, 2004 you would add 5 above. If the date of birth was December 30, > 2004 you only add four.