Questions from the classroom #1 - StudentOfFortune.com

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Asked by:

els41880
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$1.00 Questions from the classroom #1

From Mathematics: General-Mathematics
Closed, but you can still post tutorials
Due on Nov. 03, 2009
Asked on Nov 03, 2009 at 2:41:23PM

Q:

A fourth-grade student devised the following subtraction

algorithm for subtracting 84 - 27.

4 minus 7 equals negative 3. 84-27=-3

80 minus twenty equals 60. 84-27=-3 60

60 plus negative 3 equals 57. 84-27=-3+60=57

Thus the answer is 57. What is your response as a teacher?

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Posted by:

viveksomani2005
Rating (232): A+
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$0.25 do not buy this.....answer sent by message...

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Posted on Nov 03, 2009 at 2:46:50PM

A:
Preview: ... eck ur ...

The full tutorial is about 5 words long .

Posted by:

mathphys_ramesh
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$2.00 good work

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Posted on Nov 03, 2009 at 3:37:04PM

A:
Preview: ... clarificati ...

The full tutorial is about 9 words long plus attachments.

Attachments:
fr.pdf (125K) (Preview)

Posted by:

jordanblink
Rating (11): A+
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$1.00 the correctness of the algorithm along with why the carry over algorithm is better than this one

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Posted on Nov 03, 2009 at 3:53:29PM

A:
Preview: ... t for subtraction because in lengthy problems especially the one involving decimal digits the student may get confused as to find ...

The full tutorial is about 128 words long .