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A free and open set of professional development resources for learning and teaching mathematics.

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OER for Mathematics


Geometry Topics


This session includes Open Educational Resources (OER) and materials related to critical conceptions related to Geometry Topics, focusing on key understandings and misunderstandings related to similarity and angles and lines. Multiple strategies and models will be provided in the activities and applets.

Resources related to the connected Assessment, Curriculum, Instruction (ACI) cycle are provided to support the use of OER in the classroom.



Step 2. Diagnostic Assessment

Download assessment and conduct pre-assessment of the critical associated concepts and understandings. Make sure to ask students to show their work and explain their reasoning in order to gain as much information related to their mathematical thinking as possible. Good diagnostic items elicit flawed thinking and misconceptions related to the learning targets.

Save pre-assessment data including constructed and selected responses to submit and to use in collegial discussions.

Step 3. Analyze Data

Analyze data from the pre-assessment to determine patterns of error and misunderstanding. These patterns will provide direction for instruction and intervention.



Step 4. Classroom Implementation

Determine instructional activities based on data analysis. Select appropriate applets and explorations aligned with students’ needs. (See applet(s) linked below.) Prepare questions to elicit mathematical thinking and target known errors and misconceptions. Capture student thinking with video and screen casts.



Step 7. Explore Additional Related Resources
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This resource was collaboratively designed by OER in Mathematics Professional Development Project partners from Maine RSU#54 & RSU#11 and staff from Education Development Center, Inc. This work is licensed under the Creative Commons Attribution-Non Commercial-Share Alike 3.0 License.