8th Grade


The Eighth Grade mathematics program helps students develop the habits and skills necessary to continue learning beyond the course itself.  

Eighth Grade mathematicians mature as students by taking the time to understand concepts deeply, relating them to real-world observations, and working to generalize principles so that their mathematical practice becomes an integration of concrete experiences and the problem-solving power of abstract ideas. In day-to-day work, students are encouraged to express their thinking through clear, persuasive use of language, symbols, and graphics, to work towards understanding why various solutions do and do not work, to guess, check, defend, change their minds, and to change the minds of others. The primary curriculum for middle school math is Open Up Resources – Illustrative Mathematics, which is supplemented by rich problems, extensions, and practical assignments. 

Essential Questions

  • How can one idea answer many different questions?
  • What makes one solution better than another?
  • How does following up on mistakes empower me?


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    8th Grade Math

    • Rigid Transformations and Congruence

      • Recognize and apply characteristics of translations, rotations, and reflections to solve problems
      • Understand congruence as a result of rigid transformation
      • Use specific terminology and choose tools to determine congruence and extend this to the concept of proof
      • Develop abstract reasoning skills by working in purely geometric contexts


      Dilations, Similarity, and Introducing Slope

      • Draw dilations and understand similarity as a result of dilation
      • Use properties of similar figures to reason about them
      • Develop the concept of slope triangles and understand why the slope is constant everywhere on a line
      • Extend knowledge of geometric measurement with measuring tools, grids, and coordinates
      • Apply similarity with indirect measurement
      • Use knowledge of slope to write equations for lines


      Linear Relationships

      • Gain experience with proportional and non-proportional linear relationships and their representations as graphs, tables, and equations
      • Interpret coordinates of points on a graph in context
      • Develop a way to compute the slope of a line from any two distinct points
      • Develop the slope-intercept equation by geometrically translating a proportional relationship
      • Consider situations represented by negative slope


      Linear Equations and Linear Systems 

      • Write and solve equations, stating the meaning of variables, identifying assumptions, and selecting solution methods and representations
      • Determine the number of solutions for an equation or system of two equations
      • Use algebraic methods to solve systems of linear equations in two variables
      • Write and solve linear systems that represent contextualized problems


      Functions and Volume

      • Understand a function as a one-to-one relationship between inputs/independent variables and outputs/dependent
      • Express functional relationships as equations
      • Interpret functions represented as graphs, tables, descriptions, and equations
      • Use linear and piecewise functions to model real-world situations
      • Extend understanding of volume from right prisms and cylinders to cones and spheres


      Associations in Bivariate Data

      • Explore the need to use different representations to find and analyze patterns
      • Use scatter plots and fitted lines to analyze numerical data
      • Use frequency tables and bar graphs to analyze categorical data


       Pythagorean Theorem and Irrational Numbers

      • Explore algebraic and geometric strategies for proving the Pythagorean Theorem
      • Develop the definition of square root and irrational numbers from its geometric meaning
      • Apply the Pythagorean Theorem in 2- and 3-dimensions
      • Estimate square and cube roots using number line intervals and decimal approximations