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Sad faces and Negative Numbers
There’s some context that’s necessary for this post. So go read Nathan Kraft’s post about arithmetic with negative numbers. What’s the mistake? Thoughts? This piece of student work is kindly submitted...
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Positive and Negative Integers
Say something smart in the comments, and then go hang out at Chris Robinson‘s place.
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Adding and Subtracting Negative Numbers
Wha? Explain in the comments. And thanks again to Chris Robinson for the submission.
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1 – (-1) = …
Where does this mistake come from? I mean, the kid knows that 1 – 1 = 0, right? So does the kid think that 1 – (-1) = 0 too, or does the kid misconstrue this as 1 – 1? What’s your theory? Thanks to...
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Slope and Division of Negative Numbers
@mpershan Can’t tell you how many times I saw this mistake this quiz. Yikes! twitter.com/mr_stadel/stat… — Andrew Stadel (@mr_stadel) March 17, 2013 What’s the fastest way to help this kid?...
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1 divided by 2/3 is…
I’m not sure that I agree with the teacher’s diagnosis that this sort of mistake is procedural. Presumably, she means that the mistake was the result of remembering some sort of algorithm, a wrong...
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(-9) – (-4.8) = …
More and more these days, when I look at student work I’m just using it as a jumping off point for anything that I find interesting. When we started this project last June, I was only looking to...
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