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Re: Cool Math Lessons
Posted:
Feb 27, 2012 3:17 PM
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Ken Abbott wrote:
http://mathforum.org/kb/message.jspa?messageID=7677695
> Here's the lesson for Equations
> http://www.cool-math-lessons.com/2012/02/equations.html
What follows is taken from near the beginning:
* Consider this problem: "what number when added to 5,
* gives the result 20".
*
* Instead of a sentence, this problem can be written
* much shorter and clearer as an equation like this..
*
* 5 + x = 20
*
* where x denotes the number we are trying to find.
My experience suggests that it is a good idea to
spend a little time at the beginning showing how
to translate from the verbal form to the algebraic
form, such as:
What number
x
what number when added to 5
x + 5
what number when added to 5, gives the result 20
x + 5 = 20
It is also probably better to rephrase the question
in order that it lends itself better to an expansion
in this way, such as:
I am thinking of a number. I add 5 to the number.
After adding 5, I get the number 20. What is the
number I was thinking of?
Dave L. Renfro
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