Categories
Graphing Interpreting Functions

Graphing Stories

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What does this question reveal about the student’s understanding?

(Also: do you agree with the mark given by the teacher?)

Categories
Feedback Trig Identities Trigonometric Functions

Trig Identities

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What’s going on here?

Categories
Algebra 1 Graphing High School: Functions Linear, Quadratic, and Exponential Models*

Graphing Equations

graphing mistake

Three points to you if you can convincingly explain where “x = 2” comes from.

Categories
Interpreting Functions linear functions Linear, Quadratic, and Exponential Models* Solving Linear Equations

Solving for a variable

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Why do kids make this mistake?

Categories
Linear, Quadratic, and Exponential Models* slope

Slope Stuff

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What’s up? How do you help kids avoid this mistake?

Thanks again to Andy Zsiga for the submission.

Categories
Graphing Interpreting Functions

Impossible Graphs

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How would you mark these problems? What do the kids understand? What don’t they?

Categories
linear functions Linear, Quadratic, and Exponential Models*

X and Y Intercepts

math mistakes

What would the kid put as answers to the question on the right? Explain your choice in the comments.

Many thanks to Andy Zsiga for the submission.

Categories
Feedback Trig Identities Trigonometric Functions Trigonometry

Combining Like Powers

What’s up with the above? Say something smart in the comments about the implications of a mistake like this one. What’s another mistake that you would expect this student to make in the future? What’s a mistake that you wouldn’t expect the student to make?

Thanks to Jonathan Newman for the submission.

Categories
Building Functions Functions

Composition of Functions

In the comments, say something. If you’re looking for a prompt, how about “Give a theory as to why this kid made the mistake that he did.”

Categories
Building Functions logarithms

Solving logarithmic equations

Selected by: Christopher Danielson

Question: What’s up with this? Why does this piece of student work matter? Does it?