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What is 1+2x3?

Street Model is off-line
20 July 2013 09:12
StreetModel
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On my basic calculator, the answer is 9. On my Nokia phone in Portrait it is also 9, but on my Nokia turned Landscape, it is 7. On my Samsung phone either way, it is also 7.

So which is right?
It could be Lupus.... It is NEVER Lupus!!


Andy_B is off-lineSilver Member
20 July 2013 09:15
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It's 7

You need to know maths to use a calculator... and multiplication has higher precedence in the expression than addition.


20 July 2013 09:38
Buddygb
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It's 7.

http://en.wikipedia.org/wiki/Order_of_operations

B.
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Nick Atkins is off-lineGold Member
20 July 2013 09:47
NATKINS
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With proper notation the possibilities should be:

1+(2x3) = 7

(1+2)x3 = 9

QED 1+2x3 = 7 or 9 !!!

Nick
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seanb is off-lineGold Member
20 July 2013 09:54
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BODMAS to remember the order:

B - Brackets first
O - Order (exponent - i.e. squares, square roots)
D - Division
M - Multiplication
A - Addition
S - Subtraction

Technically it's BO(DM)(AS) as multiplication and division have the same precedence, as do addition and subtraction, but it's less catchy that way.

So the answer, as it's written, is 7.
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Andy_B is off-lineSilver Member
20 July 2013 09:54
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Quote from NATKINS
With proper notation the possibilities should be: 1+(2x3) = 7 (1+2)x3 = 9 QED 1+2x3 = 7 or 9 !!! Nick



no


Rich G is off-line
20 July 2013 09:55
SMILESPHOTO
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To get the answer 9, it would need to be written (1+2)x3 or, technically, 3(1+2).

As others have said, multiplication takes precedence over addition so the sum should be read as 1+(2x3).

That's your maths lesson over with for today Dave - as it's the weekend we won't set you homework!
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Anth is off-line
20 July 2013 09:57
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Just forget about it! Get out in the sun! Or cloud! Depends what day you read this.


Street Model is off-line
20 July 2013 10:07
StreetModel
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I am aware of BODMAS, but it worries me that some people doing important calculations are using basic calculators and others are using newer ones...

It reminds me of a rocket science problem which was attributed to a 'failed' probe deployment because one side (USA) were working in imperial and the other side (French, I think) were working in Metric - the net result was the probe was 'shot' from its position towards the planet rather than 'lightly floated'

It could be Lupus.... It is NEVER Lupus!!


Andy_B is off-lineSilver Member
20 July 2013 10:11
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Quote from StreetModel
I am aware of BODMAS, but it worries me that some people doing important calculations are using basic calculators and others are using newer ones...



It's not about what the age of the calculator is. It's about knowing maths. If you don't know maths you will get it wrong. 

Most calculators tally a single operation at once. That will always give the wrong answer if the person using it types the '+' first.

Maybe we shouldn't let idiots do important calculations.



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