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Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion


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July 1st, 2017, 10:21 AM   #11
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I think this had been fully examined, thanks guys, I shall prepare more newbie questions to check your knowledge of course. =p

Just jiving at the UK thing, I've heard people here call it BODMAS too.
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July 1st, 2017, 01:18 PM   #12
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Quote:
Originally Posted by MATHEMATICIAN View Post
$\displaystyle \frac{A+B+C+D}{E+F+G+H}\neq \frac{A}{E}+\frac{B}{F}+\frac{C}{G}+\frac{D}{H}$
In general you are absolutely correct of course but there are enough variables here to create a few exceptions to the rule. For example ,

$ \frac{1 \ + \ 1 \ + \ 1 \ + \ 5 }{1 + (-2) + 1 + 2} = \frac{1}{1} + \frac{1}{-2} + \frac{1}{1} + \frac{5}{2} $

You can replace $5$ by any number you wish and it still holds true. LOL there are an infinite number of cases where it works ... but that is not enough.

Thought you might find this interesting

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July 2nd, 2017, 04:55 AM   #13
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"PEDMAS" can be remembered by the mnemonic "Please Excuse My Dear Aunt Sally".

Is there a mnemonic for "BODMAS"?
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July 2nd, 2017, 05:05 AM   #14
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Is there a mnemonic for "BODMAS"?
"Brother Of My Dear Aunt Sally".
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July 2nd, 2017, 11:18 AM   #15
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Also worth mentioning is that multiplication and division must be done in the order that they occur from left to right. For example if you encounter

12÷3x2

the correct answer is 8

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July 3rd, 2017, 10:29 AM   #16
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When I was a math teacher, I provided the following order of operations:

1. Parentheses
2. Exponents
3. Multiplication/division
4. Addition/subtraction
5. Line division

Notes:
1. Multiplication and division are equal in order. So is addition and subtraction. Whichever comes first, you do first.

2. "Line division" refers to a line drawn between the elements of an expression (as in the the second post).
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July 3rd, 2017, 07:30 PM   #17
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Quote:
Originally Posted by Timios View Post
When I was a math teacher, I provided the following order of operations:

1. Parentheses
2. Exponents
3. Multiplication/division
4. Addition/subtraction
5. Line division

Notes:
1. Multiplication and division are equal in order. So is addition and subtraction. Whichever comes first, you do first.

2. "Line division" refers to a line drawn between the elements of an expression (as in the the second post).
Note number 2 is good I can see that causing confusion.
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July 9th, 2017, 11:47 AM   #18
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Would it still cause confusion if examples were given?

If so, please give an example of a possible confusion.

Last edited by Timios; July 9th, 2017 at 11:50 AM.
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July 9th, 2017, 08:50 PM   #19
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Quote:
Originally Posted by Country Boy View Post
"PEDMAS" can be remembered by the mnemonic "Please Excuse My Dear Aunt Sally".

Is there a mnemonic for "BODMAS"?
It's PEMDAS, not PEDMAS.

Big Ovary Dampens My Aunt Sally
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