I need help with 2nd grade math

[AntlerCollector]

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]

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

[Preacher Man]

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

[Preacher Man]

Weird

[mikemorvan]

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

[Death from Above]

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]

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]

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]

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

[ame="http://www.youtube.com/watch?v=ejqH1ofSx8U"]Area Model Multiplication vs Old School Method (Common Core Math) - YouTube[/ame]

[txhunt7]

that looks like the first semester curriculum for ballot counting

[Texas Grown]

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

I wonder about ya sometimes...





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

[ctom87]

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]

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

[Duckologist]

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]

How did the two 10's get there?

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Go pull your switch!!

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