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Old 11-23-2011, 06:18 AM
 
477 posts, read 657,683 times
Reputation: 67

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OK..this is driving me crazy because what I thought correct answer is not correct per teacher

This is for 3rd grade.

Question: Joseph has 26 books to put on shelves. Each shelf holds 4 books. How many shelves will she need? ------- Shelves

My Answer = 7 shelves (because 2 books will be left over which would need an additional shelf 26 = 4 X 6 + 2)

But the teacher marked the answer with a circle (which is an indicator that it is wrong) in the homework, but did not write correct answer.

I want to make sure I am thinking straight before contacting teacher (and being labelled as dumb dad )

Anyone?
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Old 11-23-2011, 06:20 AM
 
519 posts, read 698,831 times
Reputation: 624
You're right -- no question!
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Old 11-23-2011, 06:56 AM
 
Location: Chapel Hill, NC, formerly DC and Phila
8,555 posts, read 12,624,466 times
Reputation: 8315
Quote:
Originally Posted by TechRider View Post
OK..this is driving me crazy because what I thought correct answer is not correct per teacher

This is for 3rd grade.

Question: Joseph has 26 books to put on shelves. Each shelf holds 4 books. How many shelves will she need? ------- Shelves

My Answer = 7 shelves (because 2 books will be left over which would need an additional shelf 26 = 4 X 6 + 2)

But the teacher marked the answer with a circle (which is an indicator that it is wrong) in the homework, but did not write correct answer.

I want to make sure I am thinking straight before contacting teacher (and being labelled as dumb dad )

Anyone?
It must be Everyday Math (aka math that makes no sense). Good luck, and let us know what the correct answer is.
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Old 11-23-2011, 07:37 AM
 
25 posts, read 76,809 times
Reputation: 42
Although the Answer "7" is rather straight forward, there is a condition which would make it "6" ... That condition being, is the Math principal being put forward estimation rather than rational denomination? Rational denomination of 7 is correct, just as an estimation of 6 is since the left over books are equal to or less than half a shelf.

Since the problem did not expressly specify a fraction ( 1/2 in this case) of a shelf is an acceptable variable of a whole number, it is really hard say...

Last edited by HFAutistic; 11-23-2011 at 07:55 AM.. Reason: Ohh Shiney!!!
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Old 11-23-2011, 01:21 PM
 
371 posts, read 730,865 times
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Quote:
Originally Posted by HFAutistic View Post
Although the Answer "7" is rather straight forward, there is a condition which would make it "6" ... That condition being, is the Math principal being put forward estimation rather than rational denomination? Rational denomination of 7 is correct, just as an estimation of 6 is since the left over books are equal to or less than half a shelf.

Since the problem did not expressly specify a fraction ( 1/2 in this case) of a shelf is an acceptable variable of a whole number, it is really hard say...
.5 rounds up, not down, so answer in any case would be 7.
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Old 11-23-2011, 02:38 PM
 
Location: Virginia
8,106 posts, read 12,652,348 times
Reputation: 3760
The answer is 7. The teacher probably made a mistake when grading.
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Old 11-23-2011, 02:53 PM
 
19,183 posts, read 28,339,482 times
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Quote:
Originally Posted by spleuchan View Post
.5 rounds up, not down, so answer in any case would be 7.
It always rounds up sometimes, and it always rounds down sometimes. There isn't actually enough information here to tell what the correct answer is. The context of what sort of materials were being asked about is missing. Still, the most likely explanation would seem to be that the teacher marked the answer wrong in error.
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Old 11-23-2011, 03:20 PM
 
477 posts, read 657,683 times
Reputation: 67
Just an update.

I sent the homework back to school with my kid and told to ask the teacher for the correct answer.

The response is "I can't tell you. You have to figure it out"

well.
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Old 11-23-2011, 03:32 PM
 
371 posts, read 730,865 times
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Quote:
Originally Posted by saganista View Post
It always rounds up sometimes, and it always rounds down sometimes. There isn't actually enough information here to tell what the correct answer is. The context of what sort of materials were being asked about is missing. Still, the most likely explanation would seem to be that the teacher marked the answer wrong in error.
Saganista, as usual, picks a one in a million sitatuation to argue about, but I guess you are right, if we were using the Base 11 number system, .5 would round down, but here on earth, .5 rounds up.
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Old 11-23-2011, 03:43 PM
 
Location: Everywhere and Nowhere
14,131 posts, read 27,025,871 times
Reputation: 6824
Maybe the teacher's been to my house where the additional 2 books would be stacked on top of the books on 6 shelves.
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