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  1. #1
    Tour Winner Khamelion's Avatar
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    Math problem right but wrong

    Seen this one while perusing the net.

    In the US an elementary student was asked to - "Use the repeated addition strategy to solve: 5 x 3"

    The student wrote

    5x3 = 15 5+5+5

    The student had the problem marked as incorrect, the correct answer being stated as 3+3+3+3+3

    Was the incorrect answer a bit harsh?

    For me, while the student has provided the correct solution, they did not provide the correct answer to the question being asked.
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  2. #2
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    Re: Math problem right but wrong

    That reads to me 5 lots of 3

    so 3+3+3+3+3 would be correct

  3. #3
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    Re: Math problem right but wrong

    Quote Originally Posted by gmhubble View Post
    That reads to me 5 lots of 3

    so 3+3+3+3+3 would be correct
    I would read it as 5 times 3, or 5 multiplied by 3, so would say that 5+5+5 is the correct answer.

  4. #4
    Money List Winner Rooter's Avatar
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    Re: Math problem right but wrong

    Quote Originally Posted by ColchesterFC View Post
    I would read it as 5 times 3, or 5 multiplied by 3, so would say that 5+5+5 is the correct answer.
    Sorry, Disagree. While yes its harsh! I read it as 5 lots of 3. so 3+3+3+3+3
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  5. #5
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    Re: Math problem right but wrong

    Quote Originally Posted by Rooter View Post
    Sorry, Disagree. While yes its harsh! I read it as 5 lots of 3. so 3+3+3+3+3
    But there is no such thing as "lots of" in maths. The correct terminology is "multiplied by" which surely means that it is 5 multiplied by 3, or 5+5+5.

  6. #6
    Tour Winner Khamelion's Avatar
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    Re: Math problem right but wrong

    Quote Originally Posted by ColchesterFC View Post
    But there is no such thing as "lots of" in maths. The correct terminology is "multiplied by" which surely means that it is 5 multiplied by 3, or 5+5+5.
    True, but the equation is asking 5 times of 3, or 3+3+3+3+3, not 3 times of 5 which would be 5+5+5

    but on the other hand

    The equation is asking 5 multiplied 3 times which would be 5+5+5, had the equation asked for 3 x 5 which would've been 3 multiplied 5 times or 3+3+3+3+3
    Last edited by Khamelion; 29-Aug-2017 at 14:00.
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  7. #7
    Tour Winner MegaSteve's Avatar
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    Re: Math problem right but wrong

    Firstly its arithmetic not maths ...


    And, I know from watching/helping grandsons its taught/done a whole lot differently to what I was taught/shown many moons ago...

    So, won't presume that I'd know what the correct answer was these days beyond 15...
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  8. #8
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    Re: Math problem right but wrong

    I should perhaps qualify my answer by saying that it depends on how "the repeated addition strategy", which I haven't heard of before, is taught. If the repeated addition strategy is that it is 5 lots of 3 then the correct answer would be 3+3+3+3+3. The question could be aimed at determining understanding of the strategy more than getting the correct answer of 15.

  9. #9
    Tour Winner Khamelion's Avatar
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    Re: Math problem right but wrong

    Very true, my OP was based on the article I read, I've no idea how the "Repeated addition strategy" was taught in the classroom. The students answer may be factually correct, but given the required answer is something different, the student has either misunderstood what was being taught, not listened in class or applied their own logic to the get an answer.
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  10. #10
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    Re: Math problem right but wrong

    5x3 is five lots of three

    3x5 is three lots of five

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