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

Explore Armstrong numbers, identify all Armstrong numbers less than 1000, and investigate a recursive sequence that uses a similar process.

Lesson Plan

Grades: High School, 6th to 8th

Students investigate the number of chairs that can be placed around an arrangement of square tables.

Lesson Plan

Grades: 3rd to 5th

Algebraic Thinking

Solve problems involving the four operations, and identify and explain patterns in arithmetic.

3.OA.D.9

Answers the questions, "When will I ever need to solve a system of 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

Measure the length and width of a rectangle using both standard and non-standard units of measure.Then, discover that the ratio of length to width of a rectangle is constant.

Lesson Plan

Grades: 6th to 8th

Ratio & Proportion

Stats & Probability

Analyze proportional relationships and use them to solve real-world and mathematical problems.

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, 8.SP.A.2, 7.RP.A.2a