RE : Re: [Math4u] Math persons

Hi

you should be careful to make your meaning clear whenever dealing with implied multiplication (multiplication by juxtaposition rather than by an x or a dot).

16:2[8-3(4-2)]+1 = ?
16:2 [8-3(2)]+1
16 :2[8-6]+1
16 :2[2]+1 (until here you are agree, right?)

the rule says that parentheses outrank division. so the first 2 goes with the second 2 , instead of going with 16.
the expression becomes :

16:4 + 1
4 +1 = 5

conclusion :
16 : 2(2) +1 =5
and
16 : 2 x 2 + 1 = 17


 I give math lessons via email, fax,

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 members made errors when it comes to the "order of
 operations" but now , I am sure they will give the

 correct answer as Rolandjo.

 take a look at :

 http://www.atadri.com/math/order/ordermultipli.jpg

 perhaps you'll see what I mean.

 My ebook about " how to excel at the order of

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 Bodor
atadricourses
 http://www.atadri.com

 

 

--- In Math4u@yahoogroups.com, Rick <rcastrap@...> wrote:
>
> The rule is still left-to-right. Try it with a calculator or
> Mathematica.
>
> -- Rick
>
> --- "Brian E. Jensen" brianejensen@... wrote:
>
> > I just had a thought.
> > 16/2*a =8a by math convention.
> > But what happens if we leave out the multiplication sign
> > 16/2a
> > Now maybe it's wrong, but there is a tendency in my mind to think of
> > 2a as a
> > term or entity and come up with 16/2a=8/a
> > So maybe leaving out the multiplication sign was done on purpose to
> > trick
> > our subconscious. I'm not so sure what the correct answer is when a
> > sign is
> > omitted.
> >
> > Does 16/2*a equal 16/2a ?
> > Does anyone know the rule or how to handle when the multiplication
> > sign is
> > left out?
> >
> > Regards,
> > Brian
> >
> >
> >
> > ----- Original Message -----
> > From: "Mario Marotti" mmar62@...
> > To: math4u@yahoogroups.com
> > Sent: Wednesday, December 05, 2007 2:38 PM
> > Subject: RE: RE : Re: [Math4u] Math persons
> >
> >
> >
> >
> > 16 / 2 [8 – 3 (4 – 2)] + 1
> > = 16 / 2 [8 – 3 (2)] +1
> > = 16 / 2 [8 – 6] +1
> > = 16 / 2 [ ] + 1
> > = 16 / 4 +1
> > = 4 + 1
> > = 5
> >
> > Hello!
> > This is my first message in the group.
> > I think the ambiguity occurs when a fraction is written like 16/2
> > instead of
> > using the horizontal ___ quotient line.
> >
> > Writing
> >
> > 16
> > __
> >
> > 2
> >
> > instead of (16/2), you have no problem at all.
> >
> > Best regards
> > Mario
> > _________________________________________________________________
> > Express yourself instantly with MSN Messenger! Download today it's
> > FREE!
> > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>

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