# order of operations in a straight equation

#### Lunar_Lander

##### New member
Multiplication being a second order operation, it needs to be carried out first.
10+10*0=?
-> = 10+0
-> = 10

#### Artlav

##### Aperiodic traveller
Beta Tester
You're not serious, are you?

10+10*0

School, first or second grade - do multiplications and divisions first, summation and subtractions second.

#### PhantomCruiser

##### Wanderer
Moderator
Tutorial Publisher
:facepalm:
Don't they still teach "My Dear Aunt Sally"?

#### Artlav

##### Aperiodic traveller
Beta Tester
On a side note - do the sing the multiplication table in US schools, or just tell to memorise it whatever way?

#### Brycesv1

##### Crash Test Expert
awesome, this reaffirms that i was correct. i was starting to think i had missed out on something in school XP

#### PhantomCruiser

##### Wanderer
Moderator
Tutorial Publisher
@ Artlav, well there were these songs that the teacher played us for multiplication tables (each number up through 12 had their own song). Honestly I hated hearing them, but they did make it easier to memorize them.
Many years later those have been done away with I suppose. My daughter had never heard of them...

#### Izack

##### Non sequitur
On a side note - do the sing the multiplication table in US schools, or just tell to memorise it whatever way?
We were taught a few mnemonics for them in elementary school in the '90s, but otherwise just expected to read and memorise. [rant]Where I live now, they don't even do times tables at all. In middle school they start 'doubling' numbers, but they aren't taugh proper multiplication or division until high school suddenly hits them with algebra. I've taught my 7yo sister how to subtract and multiply and divide by 2, and it's put her three years ahead of the rest of her class, just by sitting down with me for two hours one weekend! :facepalm:[/rant]

#### Rtyh-12

##### New member
It's really sad. They have so much confidence... look at this one:

Zach Munchy said:
Whoever put 10 and 20 is ing retarded

Two people liked this? Really. Or the other one, which was teaching us the basics of mathematics... he answered 0 as well.

#### fireballs619

##### Occam's Taser
Donator
I went to elementary school early this last decade (early 2000's) and we learned songs to help us memorize multiplication tables. I can't say I remember them, but I do remember learning them :lol:

#### martins

##### Orbiter Founder
Orbiter Founder
Are you sure this is not a spoof? If you type "10 + 10 x 0" into google you'll find that this screenshot seems to make the rounds at the moment. I'd be the first to lament the quality of school education, but this seems a bit much.

#### Grover

##### Saturn V Misfire
Donator
BIDMAS

Brackets
Indices
Division
Multiplication
Subtraction

so brackets have BIDMAS applied to themselves before the rest of the expression, and brackets within brackets are treated first and so on, untill the "deepest" level of brackets is only treated with IDMAS

#### HarvesteR

##### Member
That's basic operator precedence...

10 + 10 * 0 is calculated like this: 10 + (10 * 0)

Standard precedence, IINM, is like this:

1. Powers, Roots
2. Multiplications, Divisions
3. Sums, Subtractions

wherever there is ambiguity (as in, 3 * 6 / 15), whichever comes first gets calculated first.

The brackets, parenthesis and braces are used to override the normal precedence... there is essentially no difference between the symbols themselves, they're just used like this { [ ( ) ] } to facilitate reading (actually, if you're coding, only parentheses are used to override precedence)

Are you sure this is not a spoof? If you type "10 + 10 x 0" into google you'll find that this screenshot seems to make the rounds at the moment. I'd be the first to lament the quality of school education, but this seems a bit much.

I also can't believe people would actually argue against this. It's 3rd grade math
But then again, as Einstein said, human stupidity IS infinite. You can't say no one would be THAT stupid

Oh well, at least MOST people answered right...

Cheers

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#### iamwearingpants

##### Just an Earth-bound misfit, I
That's basic operator precedence...

10 + 10 * 0 is calculated like this: 10 + (10 * 0)

Standard precedence, IINM, is like this:

1. Powers, Roots
2. Multiplications, Divisions
3. Sums, Subtractions

wherever there is ambiguity (as in, 3 * 6 / 15), whichever comes first gets calculated first.

The brackets, parenthesis and braces are used to override the normal precedence... there is essentially no difference between the symbols themselves, they're just used like this { [ ( ) ] } to facilitate reading (actually, if you're coding, only parentheses are used to override precedence)

But then again, as Einstein said, human stupidity IS infinite. You can't say no one would be THAT stupid

Cheers

In out school we just start multiplication in 3rd grade :facepalm:

#### HarvesteR

##### Member
In out school we just start multiplication in 3rd grade :facepalm:

Well, that depends on school systems... In brazil, the average age in 3rd grade is 9 years old... That might not be the case in other countries... grades might follow a different numbering scheme.

It might actually be 5th grade, though, I can't be sure (I seem to have blocked out any memory of elementary school like a bad trauma )

Hmm, first grade is sums and subtractions, second is multiplications and divisions, third just might be expressions... I really don't remember...

Cheers

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#### Wishbone

##### Clueless developer
...cough... Karl Friedrich Gauss ...cough... is spinning in his grave...

#### Quick_Nick

##### Passed the Turing Test
Donator
3rd grade, we learned songs for multiplication tables. Probably learned PEMDAS about the same time. I don't know of any standardized test or curriculum in the US that would allow you to not know this.

#### n72.75

Tutorial Publisher
Donator
On a side note - do the sing the multiplication table in US schools, or just tell to memorise it whatever way?

Our numbers don't sing as well.

#### HarvesteR

##### Member
I've looked around, but I can't seem to find a link to the original discussion... all I get is the image...

Does anyone have a link to it? (if it's still up that is)

Going through that discussion must be an exercise in facepalm management :lol: :facepalm:

Cheers

EDIT: Found it! it seems to be real then :facepalm:

After reading through it for a while, my faith in humanity is down by at least an order of magnitude :suicide:

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