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Re: CRANIAL-CAUDAL vs ANTERO-POSTERIOR
At 09:57 PM 3/15/2001, email@example.com wrote:
Unless you're counting on your fingers, what difference does it make
whether you're counting by 10's or 12's? And you do have practice
counting by 12's. How many hours on your clock? (Even if you're using a
24 hour clock that's still 2 12's.) How many months in the year?
Most people are familiar with a base ten system. We use it for money. We
use it for normal, every day counting. How often do you depart from the
norm and decide to add up things in a base eight system? Base
twelve? Eleven hours is still speaking in a base den system. Two-hundred
forty minutes is still in a base ten system.
Speaking from experience, fractions is one of the hardest concepts for
students to learn. It is much easier to learn the decimal system than to
HP Bowden also notes 'relatedness' as a metric advantage; for example, a
cubic metre of water is 1,000 kilograms, and other relationships among
measurements (as well as fall per second per second) are also factors of
10. Contrary to my prior observation, he argues that
multiplication/division by 10 is easier because you need 'just keep track
of the zeros'. I have some practice with keeping track of zeros. Without
a calculator, try to tell someone that 'maybe 0.3% of the 2.5 million
adults in the State are current pathological gamblers, based on a
telephone survey.' Before I worked out a better way to explain the
concept, someone responded that 25 million pathological gamblers was a
lot. I gave the number as quoted above to a recently hired (non-research)
analyst. He asked about treatment programs for the 75,000 pathological
Really, working with factors of 10 is not as easy as it might sound.
I do also think that the ability to respond to the significance, the 'feel'
of the amounts in the current system is important to people.
I disagree. Try adding up a bunch of inches and fractions of inches when
you are building something. Now try adding up a bunch of different lengths
in mm and cm. As long as you put the decimal place in the right spot, it
is the same adding most people have done since their first or second year
of schooling. Nobody said all of the math was going to be easy. Metric
brings a uniform method of comparison. One prefix is ALWAYS ten units
above its predecessor. This is a great deal easier to work with than 12
inches to a foot, 3 feet to a yard, 5.5 yards in a rod, 4 rods in a chain,
10 chains in a furlong, 8 furlongs in a mile. That doesn't even include
hands, lines, and leagues and that's just linear measurement.
Darryl Jones <firstname.lastname@example.org>
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