Math Misconceptions and Considerations HSG-CO.A.1
Look closely at errors in students’ work (formative assessment) to help you reflect and make instructional decisions to suit all students’ needs.
Ě and CDF Ě Aren’t CD
the same line?
Geometric notation is very important. Misconception: Use the diagram to the right to answer the following question. a) Name the line in two different ways
________
&
________
What to do: Be sure that students know that lines are named using any two points on the line. Use the diagram to the right to answer the following question. a) Name the line in two different ways
________
&
________
Isn’t
⃗ DE
and
⃗ ED
the same ray?
Geometric notation is very important. Misconception: Use the diagram to the right to answer the following question. b) Name the highlighted ray
________________
What to do: Be sure that students understand that a ray begins at the initial point, endpoint E, and continues through another point. Therefore, the notation should show this same information. Emphasize that the arrow in the notation should not be over the initial point. Use the diagram to the right to answer the following question. b) Name the highlighted ray
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