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-   -   I need help with 2nd grade math (https://discussions.texasbowhunter.com/forums/showthread.php?t=821059)

AntlerCollector 09-14-2021 10:02 PM

I need help with 2nd grade math
 
https://uploads.tapatalk-cdn.com/202...057275fd5c.jpg

Can someone help me understand the thought process being used to solve this?

This isn’t how I learned to do it.


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Preacher Man 09-14-2021 10:04 PM

We’re going back through 8th grade algebra right now. I have no clue what that is

Preacher Man 09-14-2021 10:05 PM

Oh, it’s breaking it down by 10’s, trying to make it easier

Preacher Man 09-14-2021 10:05 PM

Weird

mikemorvan 09-14-2021 10:08 PM

It was a simpler day when we simply learned to add, subtract, multiply, and divide.

Death from Above 09-14-2021 10:08 PM

Took my wife (28 year teacher) 15 minutes for me to get it. What a mess…she says it is common core crap

Break the 20 out - look for doubles
Subtract the 9 ( or whatever that is in the equation)

Use the answer of that (1) to check for the answer by adding it back to the double.


What an ever loving mess…only a person that thinks this is the way to learn may would vote for Biden…lol

SabineHunter 09-14-2021 10:09 PM

AC, that is completely stupid math manipulation. This is why kids have trouble with math, taking a one step problem and making it a 3 step.

First, make 20 into two values, 10 and 10. Then, subtract 9 from one of the 10s leaving 1. Now, add 1 to the other 10 and you get 11. Completely assine and schools should be embarrassed for this type of BS.

scott123456789 09-14-2021 10:10 PM

It’s showing why if you were to do the problem the old fashion way you would scratch off the two and draw a little one to borrow(or regroup).

Basically you are putting a 1 in the 10s place to represent 10, and a 10 in the ones place so you can do 10-9. After subtracting you are left with 1 in the ones place and 10 from the original.

rtp 09-14-2021 10:13 PM

Common core.......this is what will be next


txhunt7 09-14-2021 10:15 PM

that looks like the first semester curriculum for ballot counting

Texas Grown 09-14-2021 10:20 PM

So AC, your say-n you don't understand simple 2nd grade proximity algorithmic math?

I wonder about ya sometimes...



:D

The fish are biting, and there's hogs to be kill-t. Gotta go!

ctom87 09-14-2021 10:22 PM

In order to subtract 9 from 20, you first must understand how the 20 got there. Ah, two 10s. 10 take away 9 is 1. 1 plus 10 is 11. And that's how you get to the answer.

Geezy Rider 09-14-2021 10:24 PM

That’s kinda like driving through California to get to New York from Texas.

Duckologist 09-14-2021 10:24 PM

Quote:

Originally Posted by ctom87 (Post 15815242)
In order to subtract 9 from 20, you first must understand how the 20 got there. Ah, two 10s. 10 take away 9 is 1. 1 plus 10 is 11. And that's how you get to the answer.

How did the two 10's get there?

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ctom87 09-14-2021 10:26 PM

Quote:

Originally Posted by Duckologist (Post 15815250)
How did the two 10's get there?

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Go pull your switch!!

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AntlerCollector 09-14-2021 10:30 PM

My grandson got a bad grade on his math test. The way they teach it now I think I’d fail it too. :(

scott123456789 09-14-2021 10:33 PM

Quote:

Originally Posted by Duckologist (Post 15815250)
How did the two 10's get there?

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20 by definition is 2 -10’s

AntlerCollector 09-14-2021 10:36 PM

Quote:

Originally Posted by SabineHunter (Post 15815200)
AC, that is completely stupid math manipulation. This is why kids have trouble with math, taking a one step problem and making it a 3 step.

First, make 20 into two values, 10 and 10. Then, subtract 9 from one of the 10s leaving 1. Now, add 1 to the other 10 and you get 11. Completely assine and schools should be embarrassed for this type of BS.



So in order for a 7 year old to learn simple subtraction. They have to learn how to divide the first number by 2 then start solving the problem? Who came up with this mess? I don’t even know how to help him because it seems so unnecessarily complicated to solve it the way the book shows.

What was wrong with the old school way?


What if it’s 21-9?

10.5 and 10.5?

:(

rolylane6 09-14-2021 10:39 PM

Quote:

Originally Posted by Duckologist (Post 15815250)
How did the two 10's get there?

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2 pairs of 5's, duh....

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jaspermac 09-14-2021 10:41 PM

The process is called decomposing numbers. It’s a pretty common way to teach math

Benno 09-14-2021 10:44 PM

Funny thing is, I taught myself how to do common core math in the 80’s before it was the cool thing to do. Not much of an advantage on smaller numbers like above but it’s faster when working with larger numbers, at least for me it is. I struggled in math for a long time, then sometime in jr high I just started seeing and using the numbers in 10’s/100’s and found it much easier to work the problem in my head. When helping my kids with math as they were being taught common core the graphs and block pictures they used for examples just seemed to confuse things more than help.

What’s most irritating to me is most math problems my kid has now are word problems and the problem always seems to be worded to trick or deceive the student. Why can’t they just work math problems, they have an English class for reading comprehension?

Geezy Rider 09-14-2021 10:46 PM

I’m sure glad that my children didn’t have to go through that crap. I’d of probably gone to jail for getting mighty ugly with the school over that mess.

Draco 09-15-2021 12:51 AM

Quote:

Originally Posted by jaspermac (Post 15815302)
The process is called decomposing numbers. It’s a pretty common way to teach math

You're a school teacher, aren't you?

IowaHunter 09-15-2021 06:25 AM

I say make the 20 a 15 + 5 otherwise it’s racist! Keep it diverse.

CabezaBlanca 09-15-2021 06:37 AM

**** that!

jaspermac 09-15-2021 06:53 AM

Quote:

Originally Posted by Draco (Post 15815465)
You're a school teacher, aren't you?

Not a chance!

cva34 09-15-2021 06:59 AM

I fail too looking at original post....NUTZ and I took all HS maths/alg/trig/calc and made Assssss

twosixteens 09-15-2021 07:08 AM

Dumbing down of society pretty sure it is working

slayr 09-15-2021 07:26 AM

Quote:

Originally Posted by rolylane6 (Post 15815297)
2 pairs of 5's, duh....

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I thought it was 9 and 11

Goldeneagle 09-15-2021 07:45 AM

I had to google everything when my granddaughter was in grade school. I use everything from addition and subtraction up to trig every day at work. I couldn't do grade school math. :(

Duckologist 09-15-2021 07:46 AM

Quote:

Originally Posted by ctom87 (Post 15815255)
Go pull your switch!!

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LMAO you need to pull yours

Pedernal 09-15-2021 08:04 AM

Home school home school home school

AntlerCollector 09-15-2021 08:08 AM

Quote:

Originally Posted by Pedernal (Post 15815631)
Home school home school home school

I agree.

They have 4 kids. I think my DIL had all the homeschooling she could handle in 2020. :)

Pedernal 09-15-2021 08:14 AM

Quote:

Originally Posted by AntlerCollector (Post 15815641)
I agree.

They have 4 kids. I think my DIL had all the homeschooling she could handle in 2020. :)

Yes Sir I hear you.

I just hate that this is what we are doing to the kiddos in our own schools…. I say defund the teacher unions…

And good on you taking time to help your grandkids….

Buck_jane 09-15-2021 08:27 AM

Wait until he starts drawing lines and pictures to figure it out. It takes them twice as long to show there work this way than how we were taught.

BTLowry 09-15-2021 08:28 AM

Quote:

Originally Posted by twosixteens (Post 15815563)
Dumbing down of society pretty sure it is working

This is the true goal

Take something simple and complicate it

Ætheling 09-15-2021 08:41 AM

Quote:

Originally Posted by AntlerCollector (Post 15815179)
https://uploads.tapatalk-cdn.com/202...057275fd5c.jpg

Can someone help me understand the thought process being used to solve this?

This isn’t how I learned to do it.


Sent from my iPhone using Tapatalk

You were trained to do this your mind just does it automatically.

Drycreek3189 09-15-2021 08:43 AM

Quote:

Originally Posted by Geezy Rider (Post 15815249)
That’s kinda like driving through California to get to New York from Texas.

Only nobody wants to go to NY or Kali…..:)

Drycreek3189 09-15-2021 08:45 AM

Quote:

Originally Posted by jaspermac (Post 15815302)
The process is called decomposing numbers. It’s a pretty common way to teach math

Decomposing means rotting. Hmmmmm…….. I agree it’s a rotten way to teach something that simple. :D

FVR JR 09-15-2021 08:47 AM

That method looks like a solution in search of a problem...


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