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# Thread: Help for discalculus (number dyslexia)?

1. ## Help for discalculus (number dyslexia)?

Hello,

This can sometimes be rather embarrassing, but I struggle to calculate simple numbers, unless they are in groups of exactly two, or ten and need to use an abacus to calculate anything which falls outside of this restriction.

So what I'm interested to know is how I could go about finding the percentage of a number which is less or more than one hundred, using a basic electronic calculator?

My aim is to build a three column liquid layout, where I need to work out the percentage of each column and it's gutter. I know it will sound stupid to some people, but to me, even the simplest of sums represent something of a headache.

Many thanks,

2. OK, I don't know how to apply this directly to your design but to work out a percentage of something, its like this

say you want 15% (15 percent) of 200 you could get it like this

200 * 15/100 or written that is 200 times 15 divided by 100.

hth

bazz

3. Thankyou, Baz. From that, I get that 15&#37; of 200 is 30.

But my maths problem is that I have widths that I want to convert to %.

So I am trying, for instance, to discover what percentage 279 is of 800.

I'm not looking to pick anyone's brains for specific answers, but instead find methods of helping myself overcome the discalculus, just as dyslexics find ways of understanding and writing words.

Cheers,

4. The way I prefer is to use a decimal (it's simpler and requires one sum)
15&#37; of 200 = 200 &#215; .15

To solve your problem, you would find out what 1% of 800 is.
You would then divide 279 by the 1% to get your answer.
Like this: 1% of 800 = 8
279 &#247; 8 = ~35
279 is about 35% of 800.

5. ## Users who have thanked Apostropartheid for this post:

Doctor_Varney (06-21-2008)

6. From doing that, I reached 34.875 so I rounded up, as I suppose I should and got aprox. 35&#37;.

Thank you for your understanding, Cyan. I've written it down, for future reference.

7. Hey CyanLight,

where'd you find the divide symbol? or did you use an ascii code?

bazz

8. Hi Baz,

I find this helpful for finding special characters: http://graveyard.maniacalrage.net/etc/special/

The divide symbol's numerical code, in this case is: & # 2 4 7; (without the gaps, obviously). ÷

9. Originally Posted by Doctor_Varney
Hello,

This can sometimes be rather embarrassing, but I struggle to calculate simple numbers, unless they are in groups of exactly two, or ten and need to use an abacus to calculate anything which falls outside of this restriction.
is nothing embarrasing, just a specific problem. I don't remember people names, I mean full names, instead I can memorise numbers like 3.1415926 , phone numbers, and so on,

Originally Posted by Doctor_Varney
So I am trying, for instance, to discover what percentage 279 is of 800.
more directly what CyanLight said you can do this way:

249 * 100 / 800

and round low or up how you need.

Edit: probably you need what bazz give as example to compute the space which remains after you positioning some elements, let's say 2 of 15&#37; and 25%
remain: 100 - 15 - 25 = 60
and now apply bazz formula to compute if a picture fit inside the remaining space:
800 * 60 /100 = 480

regards

10. ## Users who have thanked oesxyl for this post:

Doctor_Varney (06-21-2008)

11. You should check out http://www.dyscalculiaforum.com too, lots of support

(not selling anything, it's just a non-profit forum for dyscalculics)

12. ## mental health

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