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# 4X4+4X4+4-4X4=

amywood71605

User ID: 25145404
United States
10/13/2012 09:11 AM

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4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
"Live each day like it's your last, love like you've never been hurt, and dance like no one is watching."
amywood71605 (OP)

User ID: 25145404
United States
10/13/2012 09:13 AM

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Re: 4X4+4X4+4-4X4=
she says 320 cause "Thats what the calculator says", but I'm guessing basic calculators don't use the order of operations rule.
"Live each day like it's your last, love like you've never been hurt, and dance like no one is watching."
Anonymous Coward
User ID: 20737157
United States
10/13/2012 09:13 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

please excuse my dear aunt sally.
Anonymous Coward
User ID: 25479268
United Kingdom
10/13/2012 09:15 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

You is correct.

amywood71605 (OP)

User ID: 25145404
United States
10/13/2012 09:15 AM

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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

please excuse my dear aunt sally.
Quoting: Anonymous Coward 20737157

exactly
"Live each day like it's your last, love like you've never been hurt, and dance like no one is watching."
Anonymous Coward
User ID: 212949
United States
10/13/2012 09:20 AM
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Re: 4X4+4X4+4-4X4=
Windows scientific calculator says 20
Anonymous Coward
User ID: 19710596
10/13/2012 09:24 AM
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Re: 4X4+4X4+4-4X4=
0
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

= 20. You don't even need the calculator.
(4x4) - (4x4) = 0
So you a are left with (4x4) +4 = 20

Elementary school knowledge in Russia.
Anonymous Coward
User ID: 25375560
United States
10/13/2012 09:27 AM
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Re: 4X4+4X4+4-4X4=
she says 320 cause "Thats what the calculator says", but I'm guessing basic calculators don't use the order of operations rule.
Quoting: amywood71605

20 is correct.
Anonymous Coward
User ID: 17478519
United States
10/13/2012 09:27 AM
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Re: 4X4+4X4+4-4X4=
20
Anonymous Coward
User ID: 25311324
United Kingdom
10/13/2012 09:33 AM
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Re: 4X4+4X4+4-4X4=
320
Anonymous Coward
User ID: 17478519
United States
10/13/2012 09:37 AM
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Re: 4X4+4X4+4-4X4=
she says 320 cause "Thats what the calculator says", but I'm guessing basic calculators don't use the order of operations rule.
Quoting: amywood71605

They do, but the equation is poorly written by someone intentionally attempting to make a mess of mathematical syntax so the calculator will be wrong. They're not foolproof.
Crankgorilla

User ID: 25485687
Australia
10/13/2012 09:46 AM
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Re: 4X4+4X4+4-4X4=
I got 360

There are no brackets in the original equasion. but i don't know, don't call me on it.
Anonymous Coward
User ID: 24090746
United States
10/13/2012 09:48 AM
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Re: 4X4+4X4+4-4X4=
It's Bush's fault.
Anonymous Coward
User ID: 300884
Sweden
10/13/2012 09:49 AM
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Re: 4X4+4X4+4-4X4=
You just earned the dubious accomplishment of being smarter than your friend.
Terviseks

User ID: 25392184
France
10/13/2012 09:55 AM
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Re: 4X4+4X4+4-4X4=
4x4+4x4+4-4x4

=4x4-4x4+4x4+4 (just writing the equation in an other order, doesn't change anything as it is addition/substraction)

=0 +4x4+4 (because 4x4-x4x =0)

=16+4

=20
The human mind: a ferret who is feared
Anonymous Coward
User ID: 24988597
United States
10/13/2012 09:56 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

Correct. Math requires that all multiplication and division be completed before the addition and subtraction of the resulting terms. If, however, just types in the formula from left to right, the calculator will have garbage in and will return garbage out.
El Quisqueyano

User ID: 25210489
United States
10/13/2012 10:01 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

320

Last Edited by El Quisqueyano on 10/13/2012 10:03 AM
Anonymous Coward
User ID: 300884
Sweden
10/13/2012 10:01 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

Correct. Math requires that all multiplication and division be completed before the addition and subtraction of the resulting terms. If, however, just types in the formula from left to right, the calculator will have garbage in and will return garbage out.
Quoting: Anonymous Coward 24988597

Which is why RPN (reverse polish notation) works much better in a calculator - you can feed anything in without having to use parenthesis.

In RPN, the data goes first, and the operation follows, with the result saved for use by the next operation that needs it. The OP's example would read like this in RPN:

4 4 * 4 4 * + 4 + 4 4 * -

HP makes calculators that work like this, and once you got used to it, it's much more flexible!
Anonymous Coward
User ID: 17868616
United States
10/13/2012 10:04 AM
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Re: 4X4+4X4+4-4X4=
(4x4)+(4x4)+4-(4x4)=

(16)+(16)+4-(16)=

32+4-16=20
El Quisqueyano

User ID: 25210489
United States
10/13/2012 10:04 AM
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Re: 4X4+4X4+4-4X4=
(4x4)+(4x4)+4-(4x4)=

(16)+(16)+4-(16)=

32+4-16=20
Quoting: Anonymous Coward 17868616

miqq

User ID: 25474593
Argentina
10/13/2012 10:06 AM
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Re: 4X4+4X4+4-4X4=
20
alexisj9

User ID: 1376880
United Kingdom
10/13/2012 10:07 AM
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Re: 4X4+4X4+4-4X4=
4X4+4X4+4-4X4=
16+16+4-16= 20
Anonymous Coward
User ID: 22367858
United Kingdom
10/13/2012 10:12 AM
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Re: 4X4+4X4+4-4X4=
320
Quoting: Anonymous Coward 25311324

Oh shoot! There had to be one from UK. Did you go to school in Scotland, by any chance?
alexisj9

User ID: 1376880
United Kingdom
10/13/2012 10:18 AM
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Re: 4X4+4X4+4-4X4=
320
Quoting: Anonymous Coward 25311324

Oh shoot! There had to be one from UK. Did you go to school in Scotland, by any chance?
Quoting: Merlin

No you always do the multiples first, treat them like they have brackets even if not there.
Anonymous Coward
User ID: 11332100
United States
10/13/2012 10:24 AM
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Re: 4X4+4X4+4-4X4=
This is very advanced stuff. Forth year university hear in the us. Kept classified until then.

0
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

= 20. You don't even need the calculator.
(4x4) - (4x4) = 0
So you a are left with (4x4) +4 = 20

Elementary school knowledge in Russia.
Quoting: Anonymous Coward 19710596
Anonymous Coward
User ID: 5572916
United States
10/13/2012 10:24 AM
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Re: 4X4+4X4+4-4X4=
I can do it in my head and it's 20.
Anonymous Coward
User ID: 22367858
United Kingdom
10/13/2012 11:32 AM
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Re: 4X4+4X4+4-4X4=
320
Quoting: Anonymous Coward 25311324

Oh shoot! There had to be one from UK. Did you go to school in Scotland, by any chance?
Quoting: Merlin

No you always do the multiples first, treat them like they have brackets even if not there.
Quoting: alexisj9

I know that and you obviously do too, but our countryman, Anonymous Coward 25311324, clearly hasn't got a clue.

However, I apologise for the remark, aimed at AC, about going to school in Scotland. That was a little unnecessary, perhaps. Actually, they have some very fine schools in Scotland, even if they do, rather pretentiously, call them "Academies".
Anonymous Coward
User ID: 21739049
United States
10/13/2012 11:46 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

Good god we are doomed.
Anonymous Coward
User ID: 21312842
China
10/13/2012 11:49 AM
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Re: 4X4+4X4+4-4X4=
Friend had this on FB, in an argument with her about the answer. I say 20, right?
Quoting: amywood71605

You is correct.

Quoting: Anonymous Coward 25479268

yep
Anonymous Coward
User ID: 25199763
10/13/2012 11:56 AM
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Re: 4X4+4X4+4-4X4=
20

forget the rest of the nonsense....they are tards!
Anonymous Coward
User ID: 25199763
10/13/2012 11:56 AM
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Re: 4X4+4X4+4-4X4=
she says 320 cause "Thats what the calculator says", but I'm guessing basic calculators don't use the order of operations rule.
Quoting: amywood71605

She says 320 because she is an idiot. Next!