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How do I calculate the percentage, one number taken away from another number; here is an example:
23451278 = 1067
What would be the percentage ?
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Hi;
Percentage of what to what?
The 1067 to the 2345?
So you say about 45.5%
Or do you want the percentage reduction?
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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If I told you $2345 and you told me you only wanted to pay $1067 how much percentage would you want off, would that be the same as what you mentioned 45.5% ?
Last edited by SuperLynx (20131110 04:34:22)
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Subtract 2345 from both sides.
Divide both sides by  2345.
You get .5449893390191898. So you would need a 54.49893390191898% reduction.
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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If you subtract 54% from 2345 you get 1266.3 not 1278 ?
.54% that is a decimal, hrmm
Last edited by SuperLynx (20131110 05:18:02)
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54% is not the correct answer that I gave you.
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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I never said that was the correct answer you gave me ! <sigh>
I wanted to know where you got the decimal .54 from ?
23452345 obviously gives you 0 yet you say it gives 1067 ?
If I subtract 1278 from 2345 I get 1067
1278 / 2345 = .54
Are you saying that if you wanted to pay only $1278 from the original price of $2345 that would be a .54 or 54% cut ?
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I never said that was the correct answer you gave me ! <sigh>
You are missing what I am saying. 54% is not the answer I gave you, you have rounded off the correct answer.
Post #4, that is where the 54.49893390191898% is coming from. If you keep doing your calculations as 54% you will have an error.
Are you saying that if you wanted to pay only $1278 from the original price of $2345 that would be a .54 or 54% cut ?
Nope, I am not saying any of that. First of all where do you get 54% from? I am saying if you take a 54.49893390191898% reduction you will come out with 1067 ( a number very close to it!).
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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You get .5449893390191898. So you would need a 54.49893390191898% reduction.
That is where I'm getting the 54 !
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It is not 54, it is 54.49893390191898 %.
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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I'm rounding as you said, when you round it's 54 !
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2345  54% = 1266
A little off from 1278, but close.
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I never said to round in the calculation.
So you say about 45.5%
That was just for convenience. If I were speaking that I would say about 45%. But in a calculation if you use a number that you say is about this then the answer is rounded also. That is why you are getting 1266.3 not 1278.
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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2345  45% = 1289
I don't understand what you meant
>>>That was just for convenience. If I were speaking that I would say about 45%. But in a calculation if you use a number that you say is about this then the answer is rounded also. That is why you are getting 1266.3 not 1278.
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2345  45% = 1289
The above statement is incorrect and in math correctly stating the problem is the difference between solving it and not solving it. You can not subtract 45% from 2345. You can subtract 45% of something from 2345.
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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You can't subtract 45% from 2345, you can subtract 45% of something from 2345, show me an example !
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If I get 45% off that is the decimal .45
If I get 54.49893390191898 % off that is the decimal .5449893390191898
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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In your example;
2345  .45 what is that multiplication symbol after that, all I see is a dot ?
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The dot between the .45 and the 2345 means multiply. It can also be written,
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
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The dot between the .45 and the 2345 means multiply. It can also be written,
Doing the above math always gives me 5497969.75 not 1289.75
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That's because you are doing subtraction before multiplication. When there are no parenthesis, you do multiplication before addition and subtraction.
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
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Many calculators, particularly scientific calculators (eg, M$oft's scientific calculator), will automatically do the operations in the correct order (BODMAS) without needing to use parentheses, but simpler calculators (eg, that same M$oft calculator set to the 'Standard' option) usually won't.
For key presses "2345.45x2345":
M$oft Scientific = 1289.75
M$oft Standard = 5497969.75
With my HP32SII RPN Scientific the key presses are:
2345
Enter
.45
Enter
2345
x

Answer = 1289.75
"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do."  Ted Nelson
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Reverse Polish notation?
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
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Yes...which my HP48SX Scientific has too.
"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do."  Ted Nelson
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Doing the above math always gives me 5497969.75 not 1289.75
One problem at a time. Do you understand the percentage we are talking about?
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
Offline