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 What result do you get?
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Admin
Forum Admin

USA
635 Posts

Posted - 06/19/2012 :  21:46:27  Show Profile  Reply with Quote
What result do you get when you simplify this expression? I get 13, but my son insists it is 4.

16-6x22(5-3)

Thanks,
Gisele
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the_hill1962
Advanced Member

USA
1468 Posts

Posted - 06/20/2012 :  18:47:04  Show Profile  Reply with Quote
Duplicate post:
http://www.mathgoodies.com/forums/topic.asp?TOPIC_ID=34383
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royhaas
Moderator

USA
3059 Posts

Posted - 06/21/2012 :  09:57:48  Show Profile  Reply with Quote
quote:
Originally posted by the_hill1962

Duplicate post:
http://www.mathgoodies.com/forums/topic.asp?TOPIC_ID=34383




Yes, it's a duplicate, but it touches on an important topic - operator precedence (aka PEMDAS) that many students have trouble with.
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the_hill1962
Advanced Member

USA
1468 Posts

Posted - 06/26/2012 :  15:33:58  Show Profile  Reply with Quote
This is one of the reasons why I replied with "duplicate post".
It is important that everyone (students and teachers) see all the dialog.
Having three different places would make a possibility of someone not seeing Ultraglide's excellent post.
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royhaas
Moderator

USA
3059 Posts

Posted - 06/27/2012 :  11:33:42  Show Profile  Reply with Quote
See my response today to the original post.
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the_hill1962
Advanced Member

USA
1468 Posts

Posted - 06/27/2012 :  21:31:48  Show Profile  Reply with Quote
Ahhhh, aren't calculators nice?
It really is too easy mess up and get the "13" result by hand!
quote:
Originally posted by royhaas

See my response today to the original post.

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Subhotosh Khan
Advanced Member

USA
9117 Posts

Posted - 06/29/2012 :  20:47:44  Show Profile  Reply with Quote
quote:
Originally posted by Admin

What result do you get when you simplify this expression? I get 13, but my son insists it is 4.

16-6x22(5-3)

=16-6*22*(2)

=16-122*2

= 16 - 6 * 2

= 4

Although multiplication and division has the same rank - it needs to be carried out left-to-right.
Thanks,
Gisele

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