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Math help
Posted by: bazookaman
Date: May 21, 2019 05:21AM
My daughter brought this home to me b/c she got it wrong. I thought I got it but she said my answer was wrong too. So I just wanted to see if you much smarter people knew the answer.



This is how I did it...

14^2 - (5-3)^2 + (6-2)^2

196 - 2^2 + 4^2

196 - 4 + 16

196 - 20

176




__________________________________
Never underestimate the predictability of stupidity



Edited 1 time(s). Last edit at 05/21/2019 05:28AM by bazookaman.
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Re: Math help
Posted by: PeterW
Date: May 21, 2019 05:56AM
Why did you subtract 20 in step 4 rather than adding 12? My answer is 208.
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Re: Math help
Posted by: TheCaber
Date: May 21, 2019 06:02AM
Nevermind, PeterW is correct.



=TC



Edited 1 time(s). Last edit at 05/21/2019 06:03AM by TheCaber.
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Re: Math help
Posted by: bazookaman
Date: May 21, 2019 06:05AM
The first time I did it, I also got 208. But then my daughter starting telling me about how that didn’t follow the order of operations. So you’d add before you subtracted. And that’s what started me down this path.




__________________________________
Never underestimate the predictability of stupidity
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Re: Math help
Posted by: space-time
Date: May 21, 2019 06:16AM
Nonesense

196 - 4 + 16

there is no parenthesis, so you do it left to right

You got the difficult parts right (parenthesis and exponential) and stumble upon this easy part?



Edited 1 time(s). Last edit at 05/21/2019 06:20AM by space-time.
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Re: Math help
Posted by: DP
Date: May 21, 2019 06:41AM
14^2 - (5-3)^2 + (6-2)^2

Math is all Greek to me. When did this symbol, "^", come to mean squaring? Why not just write "14 x 14"?

God, I hate math. Wasn't there a post along the same lines a while back? It was the process to solve the problem that was problem (get it?).





Disclaimer: This post is checked for correct spelling, punctuation, and grammar. Any attempts at humor are solely the responsibility of the author and bear no claim that any and all readers will approve or appreciate said attempt at humor.
My name is DP, and I approve this message.



Edited 1 time(s). Last edit at 05/21/2019 06:41AM by DP.
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Re: Math help
Posted by: bazookaman
Date: May 21, 2019 07:06AM
Quote
space-time
Nonesense

196 - 4 + 16

there is no parenthesis, so you do it left to right

You got the difficult parts right (parenthesis and exponential) and stumble upon this easy part?

When your 6th grader comes home and tells you that something you haven't done in 30 years is wrong... according to her school, then yes. You tend to stumble on the easy part.




__________________________________
Never underestimate the predictability of stupidity
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Re: Math help
Posted by: space-time
Date: May 21, 2019 08:07AM
Her math teacher is a moron.
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Re: Math help
Posted by: Golfer
Date: May 21, 2019 08:28AM
If you do the addition first you have to remember that it is not 4+16 it is -4+16.
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Re: Math help
Posted by: JoeH
Date: May 21, 2019 08:30AM
Quote
bazookaman
The first time I did it, I also got 208. But then my daughter starting telling me about how that didn’t follow the order of operations. So you’d add before you subtracted. And that’s what started me down this path.

Addition and subtraction have the same rank in the order of precedence of operations. So as mentioned the expression gets evaluated from left to right once the operations in parentheses have been done.

As for what your daughter told you, either she did not understand correctly or her teacher explained order of precedence poorly.



Edited 1 time(s). Last edit at 05/21/2019 08:30AM by JoeH.
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Re: Math help
Posted by: rz
Date: May 21, 2019 08:32AM
My son isn't great at math, much to my chagrin, but I think he would have gotten this one correct last year (4th grade). We spent a good bit of time working on problems like this, and he understood the rules of precedence.

That said, the way they teach math these days is incomprehensible. Even after you master the basics, they seem more concerned with "holistic" approach. I'll never forget when my son was in 1st grade, and not only did he have to answer "2+2=?", but he had to explain why. He knew the answer was 4, but couldn't explain why. I told him to write "Because it is". Amazingly, the teacher accepted that.

They waste time on learning different methods of calculating things that should be memorized. Single digit times tables should be memorized. Instead, they learn stupid things like counting blocks... my son still has to think about things like 6x6. He'll count it out in his head... WHY!?!?! Memorize that 6x6=36. Spend a few weeks drilling it into them, and be done with it.
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Re: Math help
Posted by: bazookaman
Date: May 21, 2019 09:05AM
After looking up what she told me (PEMDAS) I realized that the problem was probably on both sides. It was explained poorly and she understood poorly. I think it was explained (and understood) in the order of the acronym. In that case, multiplication comes before division and addition comes before subtraction. When in reality it's P E MD AS. Not P E M D A S.




__________________________________
Never underestimate the predictability of stupidity
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Re: Math help
Posted by: ztirffritz
Date: May 21, 2019 10:26AM
208



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MacResource User Map: [www.zeemaps.com]#
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Re: Math help
Posted by: Carm
Date: May 21, 2019 10:32AM
It’s no longer called PEMDAS it’s called GEMDAS. Current friends kid is in teaching program and we went over this the other day. Pretty much the same thing.
Edit: I also got 208.



Edited 1 time(s). Last edit at 05/21/2019 10:54AM by Carm.
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Re: Math help
Posted by: neophyte
Date: May 21, 2019 10:50AM
Quote
DP
14^2 - (5-3)^2 + (6-2)^2

Math is all Greek to me. When did this symbol, "^", come to mean squaring? Why not just write "14 x 14"?

God, I hate math. Wasn't there a post along the same lines a while back? It was the process to solve the problem that was problem (get it?).

The "^" means the number following this symbol is an exponent. Thus ^2 means squared, ^3 means cubed, etc.
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Re: Math help
Posted by: Robert M
Date: May 21, 2019 11:01AM
DP,

That's what you use when you can't write an exponent like you would on paper or in a standard word processor.

Robert
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Re: Math help
Posted by: Paul F.
Date: May 21, 2019 11:13AM
Funny thing is, thanks to the forum software we CAN write exponents....

142 - (5-3)2 + (6-2)2



Paul F.
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Good is the enemy of Excellent. Talent is not necessary for Excellence.
Persistence is necessary for Excellence. And Persistence is a Decision.

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Eureka, CA
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Re: Math help
Posted by: JoeH
Date: May 21, 2019 11:39AM
Quote
neophyte
Quote
DP
14^2 - (5-3)^2 + (6-2)^2

Math is all Greek to me. When did this symbol, "^", come to mean squaring? Why not just write "14 x 14"?

God, I hate math. Wasn't there a post along the same lines a while back? It was the process to solve the problem that was problem (get it?).

The "^" means the number following this symbol is an exponent. Thus ^2 means squared, ^3 means cubed, etc.

Back when I was doing programming many years ago, some languages would use the caret to signify an exponent followed. Sometimes we called it an "up-caret" to distinguish it from a similar character available in some character sets that looks like an inverted caret. That second character was sometimes used to designate that a subscript followed.
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Re: Math help
Posted by: Buzz
Date: May 21, 2019 02:38PM
142 - (5-3)2 + (6-2)2 = Thallium
==



Sometimes it is what it is...
and then there's times when it's really better.



==
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Re: Math help
Posted by: space-time
Date: May 21, 2019 04:27PM
now try this

1482-(5-3)2+(6-2)2
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Re: Math help
Posted by: DP
Date: May 21, 2019 04:59PM
Quote
space-time
now try this

1482-(5-3)2+(6-2)2


AAAAAAAAAAAAAHHHHHHHHHHHH!!!!!!!!!





Disclaimer: This post is checked for correct spelling, punctuation, and grammar. Any attempts at humor are solely the responsibility of the author and bear no claim that any and all readers will approve or appreciate said attempt at humor.
My name is DP, and I approve this message.
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Re: Math help
Posted by: graylocks
Date: May 21, 2019 11:51PM
when i joined this forum it was my understanding that there was to be no math.



"Success isn't about how much money you make. It is about the difference you make in people's lives."--Michelle Obama
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Re: Math help
Posted by: TheCaber
Date: May 22, 2019 08:11AM
Quote
space-time
now try this

1482-(5-3)2+(6-2)2

Well, numeric base conversion from octal to decimal should be done before anything else. So, 148 = 1210 is 12. And, we have:

= 122-(5-3)2+(6-2)2

= 122-(22)+(42)

= 144 - 4 + 16

= 156

Done.

You could choose to evaluate 1482 in base eight (octal) and convert the result:

1482

= 2208

= 2008 + 208

= 12810 + 1610

= 14410

= 144

But, that's a lot more effort for the same result.

Have a great day!



=TC
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Re: Math help
Posted by: btfc
Date: May 22, 2019 09:21AM
[m.youtube.com]
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Re: Math help
Posted by: space-time
Date: May 22, 2019 07:11PM
Quote
TheCaber
Quote
space-time
now try this

1482-(5-3)2+(6-2)2

Well, numeric base conversion from octal to decimal should be done before anything else. So, 148 = 1210 is 12. And, we have:

= 122-(5-3)2+(6-2)2

= 122-(22)+(42)

= 144 - 4 + 16

= 156

Done.

You could choose to evaluate 1482 in base eight (octal) and convert the result:

1482

= 2208

= 2008 + 208

= 12810 + 1610

= 14410

= 144

But, that's a lot more effort for the same result.

Have a great day!

Well done Sir!
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