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HelicopterOff Topics › What's wrong with math education in the U.S.?
05-16-2016 05:31 PM  17 months agoPost 1
Xterra

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USA

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I can't believe it! Most of my daughter's classmates (high school) could not calculate the area of an isosceles triangle given that the high was 48 cm and the perimeter 128 cm.
So sad!


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05-16-2016 06:04 PM  17 months agoPost 2
spaceman spiff

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Tucson

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The problem might be the students.

My nephew is like that. He never tried to understand what he was being taught. Just give him the formula and let him plug the numbers into his calculator. That is as far as he will ever get.

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05-16-2016 06:10 PM  17 months agoPost 3
RM3

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Killeen, Texas - USA

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you'll be surprised how many teachers cant pass their own math class tests...

I got into it with my kids 8th grade teacher one year for marking two items on his homework wrong, when they were actually done correctly. I had to actually tell my kid to forget the crap the teacher showed and learn it the way I showed. So my kid did his home work, using the steps I taught him and said it made way more sense than what the teacher was doing. (Im a recent honor university grad and made it all the way to Cal III).

anyway, Next day my kid came home upset and showed me the homework all marked up...So we went back the next day and I showed the POS teacher the correct way...I even worked the problem out, step by step, and she STILL told me I was wrong despite even working the problem in reverse as proof. It was not until after I found a copy of the solution manual online with the exact same problem that showed the answer that she quietly dismissed her action as a miscommunication...

but as for the rest of the issues on top of worthless teachers... you can thank "smart" handheld devices and addictions to social media, TV and video games for the rest on all sides from the kids, the parents, the teachers all the way up to the administrators.

Most our kids cant even write anymore... their answer to everything is "google" or youtube it.

and its our fault as parents for allowing this crap to go unchecked and for allowing garbage teachers to remain in the system.

The core of the problem lies with the teachers, THEY exude the attitude that is mimicked by the students early in life (as they also get from home). Soon they become dependent on calculators and computers for even the basic stuff. Cant spell, cant write, cant read and understand anything (unless you tell them exactly what it means)...

Kids are like raw materials...its up to those that work with it to make it into something great....bad teachers = bad students.

showing a preference will only get you into trouble, 90% of everything is crap...

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05-16-2016 06:24 PM  17 months agoPost 4
Xterra

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You guys might be right. I am worry I will end up teaching math to my kid. It took me literally 5 mins to solve this one. However, the idea of helping her with derivatives and integrals is not very appealing to me.
Little experiment, can anyone here solve this little Trigonometry problem?
Hint: Pythagoras' theorem, square binomial and voila!


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05-16-2016 06:42 PM  17 months agoPost 5
kris L

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I was told they are not teaching the kids to read scripted anymore. Has anyone heard that one? - Kris

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05-16-2016 07:16 PM  17 months agoPost 6
Cowjock

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Pa.

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You are absolutely heard right. Cursive(script)was thrown out of the school system, where my kids went to school, about 10 years ago. My biggest gripe with the above is: how are the kids going to sign their names on checks or other important documents. Oh, that's right there's docu sign!!!!

I can't stand that kids today can't stand kids today CAN'T make change without a computer!!!!!!!!!!!!!!! The dumbing down of America.

Damn that ground is hard! When's the right time to get out of this money sucking hobby?

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05-16-2016 08:16 PM  17 months agoPost 7
Xterra

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can anyone here solve this little Trigonometry problem?
Any one?


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05-16-2016 08:35 PM  17 months agoPost 8
TruckRacer

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Des Moines, Iowa

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The same issues exist with basic knowledge of history and civics. Today, most kids (and teachers) have little knowledge of WWII or the Korean War much less the basics of how our government was designed to work. Most have socialist leaning ideas and they scoff at you when you try to correct their misunderstanding of our basic system of government.

Add to that, many colleges offer so many degrees that have no employment opportunities outside of government. And those are just a couple of my hot buttons about the education system today.

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05-16-2016 08:59 PM  17 months agoPost 9
Xterra

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can anyone here solve this little Trigonometry problem?


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05-16-2016 10:33 PM  17 months agoPost 10
RM3

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Killeen, Texas - USA

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what problem?

The area of an isosceles triangle given that the high was 48 cm and the perimeter 128 cm?

or how to get rid of teachers unions...?

showing a preference will only get you into trouble, 90% of everything is crap...

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05-16-2016 10:46 PM  17 months agoPost 11
Xterra

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^^^^^^^^


Both!


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05-16-2016 11:21 PM  17 months agoPost 12
spaceman spiff

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can anyone here solve this little Trigonometry problem?
I should be able to do that easily, but for some reason I got stuck at square root of B^2 + 48^2 for a substitution of A (A being one of the long sides and B being half the base width ) Embarassed. Hahahaha!

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05-17-2016 12:10 AM  17 months agoPost 13
RM3

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area = 672

since its an isosceles triangle both left and right sides are equal so cut it in half to work with just a right triangle with 48 height, and hyp + base = 64.

plug that into perimeter formula for a right triangle and solve for base which will equal to 14...that means the hyp is 50...

plug those back into all parts of the iso triangle, 50 for the left, 50 for the right side and 28 for the base (14x2)... all together they equal the perimeter...so

plug that into the area formula for iso triangle to get 672.

its the long way but, like I said, step by step....

showing a preference will only get you into trouble, 90% of everything is crap...

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05-17-2016 04:06 AM  17 months agoPost 14
Xterra

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USA

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RM3

That's cleaver! I did it in a more complicated way I guess:

Iso Per= A + B + C = 128, since Iso triangles have two equal sides, let say A = B; C being the Iso triangle base
.
Therefore:
Iso Per = 2A + C = 128
or
C = 128 - 2C
.
Since C/2 is the right triangle base:

C = 128/2 -2C/2
or
C= 64 - C

Theorem for the right triangle:

a² + b² = c²
.
Therefore:
(64 - C)² + (48)² = c²
.
Perfect square binomial
(a - b)² = a² - 2ab + b²
.
Therefore:
(64)² - 2(64)C + C² + (48)² = c²
or
4,096 - 128C + C² + 2,304 = c²
or
6,400 -128C + C² - C² = 0
or
128C = -6,400
or
C = -6,400/-128
or
C = 50

I guess I like to over think stuff



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05-17-2016 04:48 AM  17 months agoPost 15
TruckRacer

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Des Moines, Iowa

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I always considered myself the "master" of getting to an answer the hard way.

But as long as I got the correct answer and I understood why I got that answer, I never really cared about the methodology.

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05-17-2016 05:39 AM  17 months agoPost 16
Xterra

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^^^^^^^


Some times is key to simplify things. When I started programing, I came to realize that a convoluted script will, in many cases, prevent you from obtaining result, particularly when dealing with massive data


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05-17-2016 11:26 AM  17 months agoPost 17
dschertz

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Jackson, MI

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Area = 1/2 base x height

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05-17-2016 12:56 PM  17 months agoPost 18
Xterra

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^^^^^^^^



If you get the sides you get the area immediately. So, the important part of the problem is to get the sides and base right.
The formula for area was explained by RM3 in one of his posts. In order to avoid redundancy I left it out intentionally


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05-22-2016 12:23 AM  17 months agoPost 19
AirWolfRC

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Hmmmm . . . .

Isosceles triangle . . . two right angle triangles back to back
. . . two equal pieces of a rectangle.

height=48
perimeter of isosceles triangle=128
base of right triangle (b) = 128/2 - hypotenuse (c)

128/2=b+c
64=b+c
c=64-b
48²+ b²=(64-b)² (Pythagoras)
2304+b²=4096-2*64b+b²
2304=4096-128b (solve for b)
128b=4096-2304
b=1792/128=14
area=base*height=14*48=672

Looks like the same as above post . . .
. . . but I included the area

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05-23-2016 11:28 AM  17 months agoPost 20
Heli_Splatter

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USA

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I have had some doubts as to the manner some problems are being taught in schools today. Not only do you have to solve the problem getting the correct answer, you have to use "their" method.

When I run into this wall, I try to understand the logic behind the "new" method. I don't argue with the math teacher. I want the children to love math and not have a reason to stop loving math. I want math to me easy and not feared.

As with any subject, there is not a single correct path to the right answer. My mom and I have gone round and round about teaching multiplication tables... dead technology to me. Having taught for 40 years, she knows the value of memorization. I know my multiplication tables, yet I grab a calculator.

If the time spent learning multiplication tables could be leveraged for much higher learning in math, I would say dump the tables. That is a great big IF. Most likely, it would be used(wasted) for video games.

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