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- Esse Est PercipiLv 41 decade agoFavorite Answer
To convert it to a decimal, divide it by 100.

ex: 50% = 50/100 = 1/2

All percentages are out of 100%, which is considered the "total".

so 50% is only half of the total.

- openpsychyLv 61 decade ago
We can not do with out it. In fact you are constantly using it in one form or other. For eg you want to say 'you want half it' you can ask for 50% alternately. Because 50 is half of 100. It is useful to remember the following percentages.

1/3=33.33%

1/4=25%

1/10=10%

1/20=5%

You must have figured out how we get to these values. 1/4=25% because if you divide 100 by 4 we get 25.

suppose some one asks what is 13 % of 500

all you need to do is[13/100]*500=65

what percentage is 43 out of 172?

[43/172]*100=25%

got It?

- lefangLv 51 decade ago
i am not sure of your question, do you mean how to use the calculation of a percent, or how to, and when to use the calculation. the sum of the calculation is given in good examples above.

you can use the percentage calculation instead of or as well as the average, thus 100 eat snickers however 50 find them not value for money expressed as an average would be half as a percentage would be 50 % LF

- 1 decade ago
it is quite easy u just musliply by 100 and divide tby the number that is to be found and put a percentage sign %

Example

50gm of CaC03 is present in a sample of 100gm of CaCo3 packet

(50/100)*100%=Percentage purity

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- 1 decade ago
if you mean percentage its raw number over total number multiplied by a hundred. so if your given like a total number and a percentage and you want to know the exact number simply multiply the total number by your percentage over 100. its like this:

10% of 100 so its 100 multiplied by 0.1 = 10.

- Anonymous1 decade ago
percent = per + cent = per 100

% = divided by 100

eg:

1 % = 1/100

100% = 100/100 = 1

----------------

to convert into % = amount / total * 100%

eg:

5/10 = 5/10*100% = 50%

576/700 = 576/700*100% = 82.29%

- Anonymous1 decade ago
There are many ways to use percentages in math questions.

Do you have a SPECIFIC math question?

Guido

- Anonymous1 decade ago
use the % button on your calculator!