A class that has 35 students, 24 of them finished the year. How much is that in percent?
3 Answers
Explanation:
#"express as a fraction and multiply by "100%#
#"that is "24/35xx100%#
#=(24xx100)/35%~~68.57%" to 2 dec. places"#
68.571428...%
Explanation:
defination of percent:
how many in a one hundred?
take this for example:
there are 5 balls, 2 of them is red, how much is that in percent?
we know there are 2 red balls in 5 balls
so there is 2 in a 5 : "
what if the scale is the same and you have 100 balls in total?
this is what you do:
so there is 40 red balls in 100 of them, so the percentage of 2 red balls in 5 balls is 40%
40% means "
caution:
half means
back to your question:
24 students finished the year, they are 35 of them, what if the scale doesn't change and you have 100 students in total?
in this case, we let
so the percentage is
to calculate percentage very quick on a calculator:
i hope this would help you.
If you round off a value ALWAYS stipulate the decimal places. It is all to do with being aware of the level of precision.
Explanation:
Percentage is just another fraction. However, it is a special fraction in that the bottom number (denominator) is always 100.
There are two ways of writing a fraction and they both mean
Example: suppose we had 20 percent. This can be written as:
The thing is;
As these are EXACTLY the same thing then % is the same as
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Of the whole we have
We need to change the bottom number of 32 into 100 to get our percentage.
So to change the bottom number we do this:
To maintain proportionality of the fraction what we do to the bottom we also do to the top for multiply or divide. So we have:
But
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Multiply by 100
Stick a % on the end
Until recently I thought this was not really correct. Since then I have changed my mind. Mathematically this is
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