[blindkid] multiplication in braille

Wed Oct 27 13:51:20 UTC 2010

```Hello Joy:

Here is how I would multiply 54*63. Note that this will appear properly
on a screen, but may not be very understandable with just speech.

54
63
-------
162
3240  Note the zero in the units position. This is a place holder and
keeps the columns aligned.
-------
3402

The text explanation is to multiply the top number by each digit of the one
below.  54 has been multiplied by 3 giving 162. On the next line, put a zero
below the 2. This is very important since it keeps the columns aligned. Some
teachers have students leave a blank, but this can cause problems. Next
multiply 54 by 6 giving 324. Remember you are really multiplying 54 by 60,
so the number for the second line is 3240. Next, put a dashed line unber the
numbers and add them up giving 3402. When carrying a number, it is a
the next column. My Father who taught mathematics at the high school and
college level taught me this. Hope this makes sense.

Regards,

robert

----- Original Message -----
From: "Barbara Hammel" <poetlori8 at msn.com>
To: "NFBnet Blind Kid Mailing List,(for parents of blind children)"
<blindkid at nfbnet.org>
Sent: Tuesday, October 26, 2010 11:21 PM
Subject: Re: [blindkid] multiplication in braille

> Joy,
> Okay, I'll try explaining this.  What you need to do is leave four lines
> at the top since it's a two-digit problem.  So when multiplying the ones,
> for the carried numbers you first put a line of dropped g's over the
> problem in line with the line under it.  Then you write the carried number
> over the number it's being added to.
> For the tens place, you then put another line of dropped g's over where
> you put your carried ones then do the same thing.  If you had more, you
> just keep adding the lines of dropped g's on top.
> Hope this makes sense.
> Barbara
>
> ...
> Yesterday is
> A path well-trod,
> A familiar lane
> Through sacred sod,
> Too often, I fear,
> For there are the good times
> When things are hard here,
> ...
>
> --------------------------------------------------
> From: "Joy Orton" <ortonsmom at gmail.com>
> Sent: Tuesday, October 26, 2010 7:13 AM
> To: "NFB Blindkid list" <blindkid at nfbnet.org>
> Subject: [blindkid] multiplication in braille
>
>> Hi, friends,
>> Our daughter has just started multiplying two digit numbers by two digit
>> numbers in school. We know how to line up the problem.
>>
>> Here is my question:
>> How do you indicate the carried numbers in braille? For example, in
>> multiplying the following:
>>
>>    54
>> x 63
>> --------
>> We start with three times four is twelve. Write down the two, carry the
>> one.
>> Three times five is fifteen, plus the one we carried, is sixteen. So the
>> next line of the problem is 162.
>> Then six times four is twenty-four. Write down the four, carry the two.
>> Six
>> times five is thirty, plus the two we carried, is thirty-two; write down
>> the
>> thirty-two. So the next line is 322.
>> Then we add 162 plus 3220 is  3840. In this addition there are no numbers
>> to
>> carry, but sometimes there are.
>>
>> Where do you write the carried numbers? I looked in the braille nemeth
>> guide
>> we have, and I could not find it.
>>
>> Joy
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>
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