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    Transform images through rotation, reflection, dilation, and translation using matrix multiplication.
    Lesson Plan
    Grades: 9th to 12th, High School
    Geometry
    Similarity, Right Triangles, and Trigonometry
    Congruence
    HSG-CO.A.2, HSG-CO.A.4, HSG-CO.A.5, HSG-CO.B.6, HSG-CO.B.7, HSG-CO.A.1, HSG-SRT.A.1a, HSG-SRT.A.1b
    Offers a method for finding the slope of a line from its graph. 
    Lesson Plan
    Grades: 6th to 8th, High School, 9th to 12th
    Ratio & Proportion
    Functions
    Expression/Equation
    Analyze proportional relationships and use them to solve real-world and mathematical problems.
    Interpreting Functions
    Use functions to model relationships between quantities.
    Understand the connections between proportional relationships, lines, and linear equations.
    8.EE.B.6, 8.F.B.4, HSF-IF.B.6, 7.RP.A.2b

    Construct perpendicular bisectors, find circumcenters, calculate area, and use proportions to solve a real world problem.

    Lesson Plan
    Grades: High School, 9th to 12th
    Geometry
    Congruence
    HSG-CO.D.12
    Model exponential decay.
    Lesson Plan
    Grades: 9th to 12th, High School
    Functions
    Algebra
    Interpreting Functions
    Linear, Quadratic, and Exponential Models
    Seeing Structure in Expressions
    HSA-SSE.B.3c, HSF-IF.B.4, HSF-IF.C.7e, HSF-IF.C.8b, HSF-LE.A.1a, HSF-LE.A.1c, HSF-LE.B.5, HSF-IF.A.1
    Make the connection between trigonometric rations and graphs of sine and cosine functions.
    Lesson Plan
    Grades: 9th to 12th, High School
    Functions
    Geometry
    Trigonometric Functions
    Similarity, Right Triangles, and Trigonometry
    Interpreting Functions
    HSF-IF.B.4, HSF-IF.B.5, HSF-IF.C.7e, HSF-TF.A.3, HSG-SRT.C.7, HSF-TF.A.2, HSF-TF.A.4, HSF-TF.B.5
    Use problem-solving skills to find the solution to a multi-variable problem that is solved by manipulating linear equations.
    Lesson Plan
    Grades: High School, 9th to 12th
    Algebra
    Reasoning with Equations and Inequalities
    Creating Equations
    HSA-CED.A.3, HSA-REI.C.6, HSA-REI.D.11
    Extend the Fibonacci Sequence through an algebra exploration.
    Lesson Plan
    Grades: 6th to 8th, 9th to 12th
    Ratio & Proportion
    Functions
    Stats & Probability
    Analyze proportional relationships and use them to solve real-world and mathematical problems.
    Interpreting Functions
    Investigate patterns of association in bivariate data.
    Understand ratio concepts and use ratio reasoning to solve problems.
    6.RP.A.1, 8.SP.A.1, HSF-IF.A.3, 7.RP.A.2a
    Investigate the properties of regression lines and correlation using an online interactive tool.
    Lesson Plan
    Grades: High School, 9th to 12th
    Stats & Probability
    Interpreting Categorical and Quantitative Data
    HSS-ID.B.6a, HSS-ID.B.6b, HSS-ID.B.6c, HSS-ID.C.7, HSS-ID.C.8
    Students start with the diagonals and deduce the type of quadrilateral that surrounds them.
    Lesson Plan
    Grades: 9th to 12th, High School
    Geometry
    Congruence
    HSG-CO.C.11
    Explore the amplitude, period, and phase shift by examining the graphs of various trigonometric functions.
    Grades: 9th to 12th, High School
    Functions
    Trigonometric Functions
    Interpreting Functions
    HSF-IF.C.7e, HSF-TF.B.5
    Examine and draw representations of cubes and then learn how to analyze these representations using complex numbers.
    Lesson Plan
    Grades: 9th to 12th
    Number & Quantity
    The Complex Number System
    HSN-CN.A.1, HSN-CN.A.2, HSN-CN.B.5, HSN-CN.B.6
    Investigate the concept of equivalence by "weighing" numeric and algebraic expressions.
    Web Interactive
    Grades: 9th to 12th, 6th to 8th, 3rd to 5th, High School
    Algebra
    Expression/Equation
    Algebraic Thinking
    Functions
    Reasoning with Equations and Inequalities
    Analyze and solve linear equations and pairs of simultaneous linear equations.
    Reason about and solve one-variable equations and inequalities.
    Represent and solve problems involving multiplication and division.
    Building Functions
    Solve real-life and mathematical problems using numerical and algebraic expressions and equations.
    6.EE.B.7, 7.EE.B.4a, HSA-REI.A.1, HSF-BF.B.4a, 3.OA.A.4, 6.EE.B.5, 8.EE.C.7a, 8.EE.C.7b, HSA-REI.B.3
    Use slope to approximate rate of change on a graph.
    Lesson Plan
    Grades: High School, 9th to 12th
    Functions
    Number & Quantity
    Linear, Quadratic, and Exponential Models
    Interpreting Functions
    Quantities
    HSN-Q.A.3, HSF-IF.B.4, HSF-IF.B.6, HSF-LE.B.5
    Manipulate and fold three paper circles to explore four circle theorems.
    Lesson Plan
    Grades: 9th to 12th
    Geometry
    Circles
    HSG-C.A.2
    Plot a set of data and determine a line of best fit.
    Web Interactive
    Grades: High School, 6th to 8th, 9th to 12th
    Stats & Probability
    Interpreting Categorical and Quantitative Data
    Investigate patterns of association in bivariate data.
    8.SP.A.1, 8.SP.A.2, 8.SP.A.3, HSS-ID.B.6a, HSS-ID.B.6b, HSS-ID.B.6c, HSS-ID.C.7, HSS-ID.C.8
    Use a spreadsheet to investigate rates of change among various figures created on a geoboard.
    Lesson Plan
    Grades: 9th to 12th
    Geometry
    Functions
    Congruence
    Interpreting Functions
    HSF-IF.B.6, HSG-CO.D.12
    Use polydrons to build nets and create the most appealing fish tank.
    Lesson Plan
    Grades: 9th to 12th, High School, 6th to 8th
    Geometry
    Congruence
    Geometric Measurement and Dimension
    Solve real-world and mathematical problems involving volume of cylinders, cones, and spheres.
    Solve real-world and mathematical problems involving area, surface area, and volume.
    6.G.A.2, 6.G.A.4, 8.G.C.9, HSG-GMD.A.3, HSG-CO.A.1
    Use research on the Amazon deforestation to determine whether it is occurring exponentially.
    Lesson Plan
    Grades: 9th to 12th
    Stats & Probability
    Interpreting Categorical and Quantitative Data
    HSS-ID.B.6a, HSS-ID.B.6c, HSS-ID.C.7

    Equations to solve in your head:

    \begin{array}{l}
 6,751x + 3,249y = 26,751 \\ 
 3,249x + 6,751y = 23,249 \\ 
 \end{array}

    Is this a joke? Not if you can multiply the first equation by 6,751 and the second by 3,249 in your head, and not if you use a second, simpler method.

    Problems
    Grades: 9th to 12th, 6th to 8th
    Algebra
    Expression/Equation
    Reasoning with Equations and Inequalities
    Analyze and solve linear equations and pairs of simultaneous linear equations.
    8.EE.C.8b, HSA-REI.C.6, HSA-REI.C.5
    A regular octagon is inscribed inside a square. Another square is inscribed inside the octagon. What is the ratio of the area of the smaller square to the area of the larger square?
    Problems
    Grades: 9th to 12th, 3rd to 5th, 6th to 8th
    Geometry
    Measurement & Data
    Ratio & Proportion
    Circles
    Solve problems involving measurement and conversion of measurements from a larger unit to a smaller unit.
    Geometric measurement: understand concepts of area and relate area to multiplication and to addition.
    Understand ratio concepts and use ratio reasoning to solve problems.
    6.RP.A.1, 3.MD.C.7b, 4.MD.A.3, HSG-C.A.3
    1 - 20 of 106 results
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