City-Data Forum Fairfax Elementary school math question (house, teacher, autistic)
 User Name Remember Me Password [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.

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

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

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?

11-23-2011, 06:20 AM
 519 posts, read 698,831 times Reputation: 624
You're right -- no question!

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 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.

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!!!

11-23-2011, 01:21 PM
 371 posts, read 730,865 times Reputation: 176
Quote:
 Originally Posted by HFAutistic 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.

11-23-2011, 02:38 PM
 Location: Virginia 8,106 posts, read 12,652,348 times Reputation: 3760

11-23-2011, 02:53 PM
 19,183 posts, read 28,339,482 times Reputation: 4002
Quote:
 Originally Posted by spleuchan .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.

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.

11-23-2011, 03:32 PM
 371 posts, read 730,865 times Reputation: 176
Quote:
 Originally Posted by saganista 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.

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.
 Please register to post and access all features of our very popular forum. It is free and quick. Over \$68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned. Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.

Options
X
Data:
Based on 2000-2016 data

123

 City-Data Forum