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ChrisDee
My Girls
Member since 11/06 9543 total posts
Name:
Christine
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4th grade math problem of the day PLEASE HELP
This is one of the questions on Jordan's math homework and I can not figure it out(nor can she) I am NOT a math person.
A school has 14 buses. Each bus can hold 57 students. Kim says that the buses could hold a total of 795 students. Julie says that the buses could hold a total of 798 students. WITHOUT multiplying, determine which girl could be correct. On the lines below, explain your thinking.
Now I realize what the answer is 798 but how do you do that without multplying
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Posted 4/4/11 5:19 PM  |
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annoyedTTCer
LIF Adult
Member since 4/09 3272 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Posted by ChrisDee
This is one of the questions on Jordan's math homework and I can not figure it out(nor can she) I am NOT a math person.
A school has 14 buses. Each bus can hold 57 students. Kim says that the buses could hold a total of 795 students. Julie says that the buses could hold a total of 798 students. WITHOUT multiplying, determine which girl could be correct. On the lines below, explain your thinking.
Now I realize what the answer is 798 but how do you do that without multplying
Can't multiply to get answer or at all?
Quickly in my head I see 7 x 4 = 28 so answer ending "5" is wrong
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| Posted 4/4/11 5:23 PM |
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eroxgirl
My Loves
Member since 5/05 15697 total posts
Name:
Rebecca
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Re: 4th grade math problem of the day PLEASE HELP
Math was never my subject, but English was... so I'm wondering if it's a play on words and you can find the answer by dividing instead.
Divide 798 by 57 and you get 14.
Or you can simply rule out 795 because it's impossible to get a number that ends in 5 with 57 and 14 (without doing the math, this is a rule you just know).
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| Posted 4/4/11 5:28 PM |
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Domino
Always My Miracle
Member since 9/05 9923 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
 I hate HAte HATE math but I think you have to divide
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| Posted 4/4/11 5:37 PM |
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computergirl
LIF Adult
Member since 5/05 3118 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Multiplying an odd # and an even # always results in an even #.
So the even number 798 is correct.
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| Posted 4/4/11 5:38 PM |
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Re: 4th grade math problem of the day PLEASE HELP
Could she write down that she knew it could not be 795 because 5 is not a multiple of 4 and 8 ?
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| Posted 4/4/11 5:57 PM |
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ladybug8
LIF Adult
Member since 3/07 2660 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
divide
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| Posted 4/4/11 5:57 PM |
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lululu
LIF Adult
Member since 7/05 9511 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Posted by computergirl
Multiplying an odd # and an even # always results in an even #.
So the even number 798 is correct.
This is what i would say too - I think this is probably the answer they are looking for.
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| Posted 4/4/11 7:39 PM |
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jmf423
:)
Member since 5/05 6372 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
divide
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| Posted 4/4/11 7:56 PM |
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Teach
LIF Infant
Member since 6/10 263 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
draw and repeat addition
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| Posted 4/4/11 8:10 PM |
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Re: 4th grade math problem of the day PLEASE HELP
I would add 57, I think that was the number, 14 times. Or, if you child can do long division, divide.
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| Posted 4/4/11 8:10 PM |
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ChrisDee
My Girls
Member since 11/06 9543 total posts
Name:
Christine
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Re: 4th grade math problem of the day PLEASE HELP
They JUST started to learn long division and my DD thought she should divide to get the answer but that division problem is beyond her skill set thus far. She was not allowed to multiply at all. Grrrrr, I hate math and this is only 4th grade
Message edited 4/4/2011 9:29:35 PM.
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| Posted 4/4/11 9:28 PM |
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ChrisDee
My Girls
Member since 11/06 9543 total posts
Name:
Christine
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Re: 4th grade math problem of the day PLEASE HELP
Posted by Teach
draw and repeat addition
what does this mean? LOL
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| Posted 4/4/11 9:30 PM |
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cj7305
=)
Member since 8/05 12296 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Posted by ChrisDee
Posted by Teach
draw and repeat addition
what does this mean? LOL
Add 57, 14 times. Also she could draw a picture. 14 squares (buses) with 57 circles in each (or something similar).
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| Posted 4/4/11 9:41 PM |
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ChrisDee
My Girls
Member since 11/06 9543 total posts
Name:
Christine
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Re: 4th grade math problem of the day PLEASE HELP
Posted by cj7305
Posted by ChrisDee
Posted by Teach
draw and repeat addition
what does this mean? LOL
Add 57, 14 times. Also she could draw a picture. 14 squares (buses) with 57 circles in each (or something similar).
This is ONE question out of 2 pages of math problems, we could be up all night drawing all these pics She will never leave an answer blank, even though I told it was OK. She is too much of a perfectionist
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| Posted 4/4/11 9:56 PM |
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aw29
LIF Adult
Member since 3/06 1075 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
I teach 4th grade and I would think she could do repeated addtion-wonder why she cant multiply-good luck!!!!!
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| Posted 4/4/11 10:02 PM |
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dpli
Daylight savings :)
Member since 5/05 13973 total posts
Name:
D
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Re: 4th grade math problem of the day PLEASE HELP
Posted by computergirl
Multiplying an odd # and an even # always results in an even #.
So the even number 798 is correct.
This.
Or, you can figure that any # ending in a 5 is a mulitple of 5. Since neither of the other 2 #s is a multiple of 5, neither is the correct answer.
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| Posted 4/4/11 10:09 PM |
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VickiRG510
I'M A MOMMY!
Member since 3/09 1042 total posts
Name:
Vicki
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Re: 4th grade math problem of the day PLEASE HELP
Posted by cj7305
Posted by ChrisDee
Posted by Teach
draw and repeat addition
what does this mean? LOL
Add 57, 14 times. Also she could draw a picture. 14 squares (buses) with 57 circles in each (or something similar).
Exactly. 
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| Posted 4/4/11 10:11 PM |
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fight the future
Master of my domain.
Member since 3/10 2067 total posts
Name:
Rebecca
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Re: 4th grade math problem of the day PLEASE HELP
This is why I always hated math.
Who the hell cares if you multiply? Give this problem to the school bus logistics people and let the rest of the world move on!!
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| Posted 4/4/11 10:12 PM |
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ChrisDee
My Girls
Member since 11/06 9543 total posts
Name:
Christine
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Re: 4th grade math problem of the day PLEASE HELP
Posted by aw29
I teach 4th grade and I would think she could do repeated addtion-wonder why she cant multiply-good luck!!!!!
This homework is from a book for NYS test prep called Buckle Down NY. Some of the questions make me In about 2 seconds, she knew the right answer with multiplication, so why make it more then that? IDK
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| Posted 4/4/11 10:19 PM |
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MissJones
I need a nap!
Member since 5/05 22136 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Posted by ChrisDee
Posted by aw29
I teach 4th grade and I would think she could do repeated addtion-wonder why she cant multiply-good luck!!!!!
This homework is from a book for NYS test prep called Buckle Down NY. Some of the questions make me In about 2 seconds, she knew the right answer with multiplication, so why make it more then that? IDK
I have buckle down. I think one of the main ideas is that on the NYS math test, they want the children to EXPLAIN how they get their answers, not just figure it out.
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| Posted 4/5/11 6:28 AM |
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GoldenRod
10 years on LIF!
Member since 11/06 26792 total posts
Name:
Shawn
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Re: 4th grade math problem of the day PLEASE HELP
Posted by dpli
Posted by computergirl
Multiplying an odd # and an even # always results in an even #.
So the even number 798 is correct.
This.
Or, you can figure that any # ending in a 5 is a mulitple of 5. Since neither of the other 2 #s is a multiple of 5, neither is the correct answer.
I believe this is the right answer. It helps reinforce certain rules of math, and if you know that a number that ends in 5 has to have at least one multiplier that ends in 5, it makes other math and estimating much easier.
The odd and even multiplication answer is also good. Another way of quickly determining if an answer could be correct or not.
It's not a "math" problem, per se, it's a math concept problem, hence the no multiplication rule.
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| Posted 4/5/11 7:44 AM |
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dpli
Daylight savings :)
Member since 5/05 13973 total posts
Name:
D
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Re: 4th grade math problem of the day PLEASE HELP
Posted by ChrisDee
Posted by aw29
I teach 4th grade and I would think she could do repeated addtion-wonder why she cant multiply-good luck!!!!!
This homework is from a book for NYS test prep called Buckle Down NY. Some of the questions make me In about 2 seconds, she knew the right answer with multiplication, so why make it more then that? IDK
They are trying to teach them to problem solve, not just multiply.
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| Posted 4/5/11 11:30 AM |
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jilliibabii
Mrs. O'Connor
Member since 6/10 12821 total posts
Name:
Jillian
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Re: 4th grade math problem of the day PLEASE HELP
You're supposed to divide. You can divide 795 or 798 by either 57 (# of passengers) or by 14 (the # of buses) and come up with the right answer which is 798.
ETA: I totally understand why they said you can't multiply. They are trying to show that multiplication/division are complentary just like addition and subtraction are.
Message edited 4/5/2011 11:34:13 AM.
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| Posted 4/5/11 11:32 AM |
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bobby769
LIF Infant
Member since 7/10 253 total posts
Name:
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Re: 4th grade math problem of the day PLEASE HELP
Posted by computergirl
Multiplying an odd # and an even # always results in an even #.
So the even number 798 is correct.
Computer girl is correct.
Multiplying any # or #s by just one even # will result in an even #.
12*23 = 276 (even*odd = even)
1008*46 = 46368 (even*even = even)
49*21 = 1029 (odd*odd = odd)
This holds true even if you are multiplying more than 2 #s. If just one of those #s is even, the result will be an even#. This holds true only for whole #s.
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| Posted 4/5/11 4:05 PM |
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