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Admin
Forum Admin
USA
633 Posts |
 Posted - 06/19/2012 : 21:45:18
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What result do you get? I get 13, but my son insists it is 4.
16-6x2 2(5-3)
Thanks,
Gisele |
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royhaas
Moderator
USA
3039 Posts |
Posted - 06/20/2012 : 09:50:03
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16-6 22(5-3)=16-622(2)=16-624=16-124=16-3=13. |
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Admin
Forum Admin
USA
633 Posts |
Posted - 06/20/2012 : 10:17:05
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quote:
Originally posted by royhaas
16-622(5-3)=16-622(2)=16-624=16-124=16-3=13.
Thanks Roy. My thoughts exactly. This question will be included in an upcoming Flash game. |
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Ultraglide
Advanced Member
Canada
278 Posts |
Posted - 06/25/2012 : 12:40:35
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| Looking at part of the question, i.e. 6x22(2), this is the same as 6x22x2. Now if we follow the order of operations - multiplication and division in order from left to right this gives 12. So the final answer is 4. |
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Admin
Forum Admin
USA
633 Posts |
Posted - 06/25/2012 : 15:53:14
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quote:
Originally posted by Ultraglide
Looking at part of the question, i.e. 6x22(2), this is the same as 6x22x2. Now if we follow the order of operations - multiplication and division in order from left to right this gives 12. So the final answer is 4.
Thank you for your input, UltraGlide. I guess if us math folk can't agree on the solution, then this is not a good problem to hard code into a Flash game. I will post it on Facebook, though.
Gisele |
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Ultraglide
Advanced Member
Canada
278 Posts |
Posted - 06/25/2012 : 17:02:22
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| If you want to answer to come out to 13, just put parentheses around the 2(2) i.e. [2(2)]. |
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the_hill1962
Advanced Member
USA
1440 Posts |
Posted - 06/26/2012 : 15:54:23
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I agree that the answer is 4.
This is the reason why I have never liked the
"Please Excuse My Dear Aunt Sally" (or PEMDAS) acronym.
They do come to me knowing the acronym PEMDAS though so I suppose it served its purpose (having them remember the order).
I tell them since multiplication and division are at the same level, so that PEMDAS is misleading if you forget that detail.
This topic provides an example.
I write on the board PEmdAS.
I hook together the md and the AS (sort like they do in company logos hooking together letters).
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Edited by - the_hill1962 on 09/13/2012 12:47:48 |
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royhaas
Moderator
USA
3039 Posts |
Posted - 06/27/2012 : 11:32:08
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If you faithfully follow the PEMDAS precedence rules, then the answer on almost any calculator is 4,
16-6*2/2*(5-3)=16-6*2/2*2=16-6*2/2*2=16-(6*2/2*2)=16-12=4.
Multiplication and division have the same precedence, so the (re-)grouping is allowed. It seems that this is a common problem when both multiplication and division are concerned. That's why I trust my calculator more than my hand arithmetic.
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Admin
Forum Admin
USA
633 Posts |
Posted - 06/27/2012 : 11:38:58
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Thanks everyone for your input!
Gisele |
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Topic |
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Interactive Math Goodies Software
Simplify this expression
