[Pibe-division] borrowing in subtraction problems with Nemeth code

[rjaquiss]

Hello:

 

     Long years ago when I learned carrying and borrowing, we kept the numbers in our heads. I would see a problem set up:

 

  242

- 163

A dashed line was below. We knew to borrow 1 from 4 to make 12. 12-3 = 9

9 was written in the units column. The 4 was really then a 3 and borrowing 1 from the 2 made 13. 13-6 = 7.

7 was written in the tens column. The 2 was really a 1 and 1-1 = 0. Since 0 was the leading digit. It wasn’t recorded. A classic Perkins worked well for this.

 

Regards,

 

Robert

 

From: PIBE-Division [mailto:pibe-division-bounces at nfbnet.org] On Behalf Of Marianne Denning via PIBE-Division
Sent: Monday, April 10, 2017 8:21 PM
To: Professionals in Blindness Education Division List
Cc: Marianne Denning
Subject: Re: [Pibe-division] borrowing in subtraction problems with Nemeth code

 

Yes, it is what I am asking. If the problem is 242 - 163 would you have them use the cancellation marks around the numbers that need to be changed? It just seems like so much work. I have been blind all of my life but did not learn or use Nemeth code in school.

 

On Mon, Apr 10, 2017 at 10:56 PM, Greg Aikens via PIBE-Division <pibe-division at nfbnet.org> wrote:

Hi Marianne,
I typically only showed my students proper Nemeth code for borrowing so they could understand what is in the textbook. I never had them “cross out” anything using the proper Nemeth symbols when writing their problems. Is this what you are asking or am I missing the mark?


> On Apr 10, 2017, at 10:24 PM, Marianne Denning via PIBE-Division <pibe-division at nfbnet.org> wrote:
>
> Okay, I hate teaching borrowing using proper Nemeth code. It is so complicated. I know the abacus is the best way to accomplish this but what would you suggest in teaching subtraction when borrowing is involved?
>
> --
> Marianne Denning, TVI, MA
> Teacher of students who are blind or visually impaired
> (513) 607-6053 <tel:%28513%29%20607-6053> 
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-- 

Marianne Denning, TVI, MA

Teacher of students who are blind or visually impaired

(513) 607-6053

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