[blindkid] multiplication in braille
Robert Jaquiss
rjaquiss at earthlink.net
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
necessary skill to keep the digit(s) in your head until they are added in
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,
> A road we travel
> 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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