?

Log in

No account? Create an account

Previous Entry | Next Entry

Undue Obsession II

Okay I just did it my way and it works much better.

         7x + 7y = 8x - 8y
         8x - 7x = 7y + 8y
               x = 15y
Plug into first eq:
     7(15y) + 7y = 5432
       105y + 7y = 5432
            112y = 5432
               y = 48.5
And then you'd continue from here to get the speed of the aircraft in still air.

The key is that the two original equations are equal to the same constant. When I put them together to get rid of that constant in the first line of this solution, I was in effect doing the adding and subtracting of the two lines of the previous solution in one fell swoop.

So, then my question is, WHY THE HELL DOES THE SCHOOL CURRICULUM TEACH KIDS HOW TO DO THINGS THE STUPID WAY?!?!?!?!

Particularly when it really doesn't make any sense. It's not easier to understand and it requires a leap of faith that it will work out. In my solution, you can actually see what's going on with the x's and y's and all the laws of Math symbols are preserved.

Comments

bride
Oct. 20th, 2001 01:23 pm (UTC)
Can't Teach Everything
Oh I know that =) And I'm not that confident in my own teaching skills ("those who can..." and all =D) I'm probably going to enroll my children in a Montessori school and then enroll them in:

Manditory - music lessons (theory and piano), a Math school, Chinese school.

Optional - ballet, soccer, summer camp, Buddhism for Children sessions or whatever else they have interest in.

We might put them in Kumon for a year, or just long enough to get the experience points but not too long that it damages their reasoning skills.
xinit
Oct. 20th, 2001 01:50 pm (UTC)
Re: Can't Teach Everything
I'll bite; what's a Montessori School and what's Kumon?
bride
Oct. 20th, 2001 03:49 pm (UTC)
Re: Can't Teach Everything
Montessori Online. I've heard really good things about it, I'm still trying to understand what exactly it means though.

Kumon is a Math exercise program where you do batches of practice questions, then timed tests that consist of the same types of questions that vary with the skill level (like 2+3, 5+8, 9+2, etc.). You only pass the test if you get all the questions right. After you pass, you go on to the next level (12+4, 15+7). Each skill level gets harder and harder. It goes on with subtraction, multiplication, division, fractions, and on and on.

It builds experience with simple calculations. The more you do it, the more you recognize patterns to the numbers and remember the answers. That's why I say, I wouldn't have my kids doing this for too long and I'd want to balance this rote drill exercising with the reasoning and problem solving technique.

Husband Guy did Kumon for 3 years. It's made a difference in his calculation speed.
xinit
Oct. 20th, 2001 04:38 pm (UTC)
Re: Can't Teach Everything
Yeah - need to teach the kids how to be able to play blackjack without sitting there staring blankly at the numbers for a second. I'm no good at the pattern recognition for the most part, and I blame that for my inability to play cribbage.

Profile

eLouai
bride
The Bride of the First House

Latest Month

March 2015
S M T W T F S
1234567
891011121314
15161718192021
22232425262728
293031