DanielLee <dlh3648@[EMAIL PROTECTED]
> wrote:
: For Example this works
: $1,000 dollars @[EMAIL PROTECTED]
10.000 = $10,000 pesos
: $10,000 pesos @[EMAIL PROTECTED]
.10000 = $ 1,000 dollars
: Adding .5 to the dollar to peso and subtracting .5 from the pesos to
: dollar does not work
: $1,000 dollars @[EMAIL PROTECTED]
10.5000 = $10,500 pesos
: $10,500 pesos @[EMAIL PROTECTED]
.09500 = $997.50 dollars
: If I understand Kevin correctly I just did not carry it out far enough?
This is a yes AND no answer...
On one side of the coin, it is because it wasn't brought out far enough,
on the other side of the coin, it is because .09500 is not the right
number
but is close.
As a basic explanation:
It may be the way you're using the decimal number. A decimal number is a
representation of a fraction. A fraction is a representation of a
ratio. When doing the conversions you're doing, you may find it
easier to think along the lines of a ratio.
10.5 pesos for every 1 dollar
A ratio of 10.5:1
As a fraction that's: 10.5/1 or 10.5
So the conversion is to multiply dollars by the cvonersion ratio of 10.5.
x dollars * 10.5 conversion ratio gives you y pesos
To do the opposite you need to flip things around. You're now saying
that you will receive 1 dollar for every 10.5 pesos. A ratio of 1:10.5
As a fraction that is 1 / 10.5. Which is .095238 (repeated) -- you'll
notice it is close to what you had, but it was arrived at differently
and therefore gave a number closer to the actual number.
10,500 * .095238 will only be 999.999 because yes, it wasn't carried out
far enough. Hence the "yes and no" answer.
-dave
--
submissions: post to k12.ed.math or e-mail to k12math@[EMAIL PROTECTED]
e-mail to the k12.ed.math moderator: kem-moderator@[EMAIL PROTECTED]
website: http://www.thinkspot.net/k12math/
newsgroup charter: http://www.thinkspot.net/k12math/charter.html
|
