Categories
Building Functions Linear, Quadratic, and Exponential Models* Solving for a Variable

Equations with multiple variables and constants

IMG_2596

Are these two mistakes related? What’s the fastest way to help this student?

 

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

IMG_2546

Why do kids make this mistake?

Categories
Linear, Quadratic, and Exponential Models* slope

Slope Stuff

andy2

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

Thanks again to Andy Zsiga for the submission.

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
Linear, Quadratic, and Exponential Models* slope

Slope of Parallel and Perpendicular Lines

Why is this mistake attractive to the student? How could you make it unattractive?

Thanks to Tina Cardone for the submission.

Categories
Graphing High School: Modeling linear functions Linear, Quadratic, and Exponential Models*

Linear Modeling and Graphing

What’s the mistake? How would you help?

Thanks to John Weisenfeld for the submission.

Categories
Algebra 1 linear functions Linear, Quadratic, and Exponential Models* slope

Slippery Slope

The submitter of this mistake reports that the student is a “high flyer.”

  1. What is this student’s confusion?
  2. Why made this mistake so tempting? After all, if a student just doesn’t understand “slope” there are a million things that they could do wrong. Why this one?

Thanks to Jeff de Varona for the submission. Go check out his blog and follow him on twitter.

Categories
Graphing Linear, Quadratic, and Exponential Models* slope

Slopedy Slope Slope

Say something intelligent about this bit of student work.

Categories
Graphing Linear, Quadratic, and Exponential Models* Quadratics

Axis of symmetry and vertex

What does this mistake reveal about the kid’s thinking? How would you take the kid’s thinking to the next level?