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ossie85's school of ROCK (well, maths, really)

Started by ossie85, October 14, 2011, 09:37:47 AM

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Master Q

#30
October 15, 2011, 11:52:36 AM
Quote from: PowerBug on October 14, 2011, 11:14:32 PM
Quote from: My Chumps on October 14, 2011, 11:04:48 PM
I think people just put 0 when they skim the question, and without really thinking about it.
Also, I was always taught that it was BOMDAS, not BODMAS  :-\
Defidently BODMAS, but like i said earlier, somewhere it's been changed to BEDMAS. I learnt it as BODMAS until year 4, then BEDMAS. The 'E' is for exponents, like powers and shower.
Someone also told me they learnt it your way - except it was BIDMAS - I, for indices.

ossie85

#31
October 15, 2011, 01:11:03 PM
Lots of different names:

from wiki:
PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction)
Parentheses may be called Brackets, or symbols of inclusion and Exponentiation may be called either Indices, Powers or Orders, and since multiplication and division are of equal precedence, M and D are often interchanged, leading to such acronyms as BEDMAS, BIDMAS, BODMAS, BERDMAS, PERDMAS, and BPODMAS

Maca24

#32
October 15, 2011, 02:39:40 PM
It is 0 yea?

Maca24

#34
October 15, 2011, 02:58:26 PM

PowerBug

#35
October 15, 2011, 03:28:09 PM
Quote from: Maca24 on October 15, 2011, 02:58:26 PM
Quote from: CrowsFan on October 15, 2011, 02:56:37 PM
No it is 14
lol how?
only th last 1 is multiplied by 0. There' ain't any brackets. Then there's 16 1's left, 2 are taken away from each other. That leaves 14 1's added to each other. Thus 14. ;)

ossie85

#36
October 15, 2011, 04:18:40 PM
Quote from: PowerBug on October 15, 2011, 03:28:09 PM
Quote from: Maca24 on October 15, 2011, 02:58:26 PM
Quote from: CrowsFan on October 15, 2011, 02:56:37 PM
No it is 14
lol how?
only th last 1 is multiplied by 0. There' ain't any brackets. Then there's 16 1's left, 2 are taken away from each other. That leaves 14 1's added to each other. Thus 14. ;)

Yup.

Type it into Excel or a scientific calculator (regular calculators will get it wrong) and you'll see it is 14 :)

hawk_88

#37
October 15, 2011, 04:37:11 PM
Quote from: ossie85 on October 15, 2011, 04:18:40 PM
Type it into Excel or a scientific calculator (regular calculators will get it wrong) and you'll see it is 14 :)

Correction, wrong assuming you are following a particular standard  :P

ossie85

#38
October 16, 2011, 06:30:40 AM

Right so, 18/30 got it wrong :(

Assuming the 15, 16, 17 are just reading the question wrong.

So the solution, just to explicitly state it, is:

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1+1x0

= 1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1+0 (you always do multiplication and division before addition and subtraction)

=14 (noting the minus 1 hidden in there)

Someone said 4, and I'm guessing that is because they did addition before subtraction. That is the confusing thing about BODMAS sometimes...

BODMAS means

You do brackets and orders first, from left to right.

After that you do division and multiplication next, from left to right.

And then the addition and subtraction, from left to right.

So you don't to addition BEFORE subtraction, you do them at the same time.

So it really should be (BO)(DM)(AS) lol ;)

Ziplock

#39
October 16, 2011, 06:51:20 AM
actually I voted 4 for lolz :P

valkorum

#40
October 17, 2011, 10:04:11 PM
14

Dudge

#43
October 18, 2011, 10:46:43 PM
I'm sticking with 0 :P lol

ossie85

#44
October 19, 2011, 07:41:27 AM
Quote from: Dudge on October 18, 2011, 10:46:43 PM
I'm sticking with 0 :P lol

I'll get my spanking-ruler out!
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