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Grade 7: CK-12 Middle School Math Concepts


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This resource was reviewed by OSPI in Spring 2015. Learn more about the review process and the data analysis approach.

The version reviewed was last updated: 3/30/2015.

Background from OER Project Review Team
CK-12 Foundation is a non-profit organization that creates and aggregates curated STEM content. Editing tools are built into the online system to facilitate personalization of content. Multiple formats allow for creation of device agnostic materials. The CK-12 platform offers many supplemental video, audio, and interactive, learning objects and real-world applications that can be accessed to adapt and remix the Flexbook. This should factor into the viewer

IMET (Learn more)

Chart with scale from 0 (Strongly Disagree) to 3 (Strongly Agree). Consistent Content: , Rigor & Balance: , Practice Connections: , Standards for Math Content: , Quality Indicators: .

EQuIP (Learn more)

Revision needed (4.5)
Chart with scale of 'meets criteria' from 0 (None) to 3 (All). Alignment: 0.75, Key Area of Focus: 1.75, Instructional Supports: 1.5, Assessment: 0.5.
Ratios, Rates, and Proportions

Achieve OER (Learn more)

Chart with scale from 0 (Weak) to 3 (Superior). Explanation: 2.0, Interactivity: 2.0, Exercises: 1.25, Deeper Learning: 1.25.
Ratios, Rates, and Proportions

See standard error chart for the review scoring

Reviewer Comments (Learn more)

Moderate (2.5)

Comments/Ideal Use:

Very thorough in inclusion and explanation of CCSS in this unit (Focus and Coherence). This resource offers a variety of modalities for learners and includes activities designed to elicit student discourse.

The resource is good for an experienced teacher with the ability to write summative assessments and develop DOK level 3 and/or level 4 activities.


  • Limited accessibility for ELL and SPED students; No evidence of scaffolding or use of high leverage ELL strategies.


  • Adjust instructional materials to reflect accessibility for more diversity of student learners.

Comments/Ideal Use:

Good resource for students to see step by step solving process. Lots of teacher thinking provided for students to follow. Every lesson has teacher thinking and steps to solving exercises provided, as well as videos of how to do problems.


  • Too many off grade level topics - surface area/volume of pyramids and cones, Pythagorean theorem, geometric transformations, similarity of figures and congruence.
  • The major work of the grade is not the focus - every topic is treated equal and the major work is not connected to the other standards. No deep understanding is developed.


  • Connect the ideas instead of a topical approach of tell how to do different mathematical skills.

Comments/Ideal Use:

Encourages procedural fluency - written problems and online adaptive problems are available for each section. Recommends lessons for each Common Core Standards (not all standards have recommended lessons and some don't fully address the standards but the feature is very useful)

An experienced teacher could use the resource as supplemental material and assign the online practice problems.


  • Missing content:
    • conceptual understanding of ratios/proportions does not develop concept of proportion using graphs
    • doesn't include applications for inequalities
    • doesn't include constructing triangles (7.G.A.2)
    • doesn't describe two-dimensional figures and plan sections of right rectangular prisms
    • doesn't include using random sampling to draw inferences about a population
    • doesn't include drawing informal comparative inferences about two populations
    • explanation of probability is weak
    • doesn't include finding probabilities of compound events using organized lists, tables, and tree diagrams
  • Focuses on algorithms, not conceptual understanding - immediately introduces the cross-product algorithm to solve proportions
  • Does not provide resources that encourage developing deeper understanding, constructing viable arguments, etc. - Exercises and practice problems (although good) focus on procedural fluency


  • Add summative assessments.
  • Include missing content.
  • Develop conceptual understanding prior to introducing algorithm.
  • Expand exercises and practice problems to include problems that develop deeper understanding and require students to construct viable arguments.

Creative Commons License
This work by the Office of Superintendent of Public Instruction is licensed under a Creative Commons Attribution 4.0 International License.