CK-12 Foundation

Concept Based Learning

Dividing decimals in word problems

Graphs of Horizontal and Vertical Lines: An Explanation (Algebra I)

Decimal Multiplication and Division Word Problems

Graphs of Horizontal and Vertical Lines: An Application (Algebra I)

Find the unknown dimension of a cuboid given the volume

Indirect Proofs in Algebra and Geometry: Examples (Basic Geometry Concepts)

Determine the missing minute hand.

Multiply Binomials

Congruent Triangles: Examples (Geometry Concepts)

Volume of a Cube or Cuboid using V = lwh

Checking Solutions to Inequalities: An Explanation (Algebra I)

Area and Perimeter of Square

Check Solutions to Inequalities: An Application (Algebra I)

Applications of Linear Systems: An Explanation (Algebra I)

Applications of Linear Systems: An Application (Algebra I)

Thermoregulation

Find height or base area given the volume

Perimeter of Composite Figures

Factoring the Difference of Squares: An Explanation (Algebra I)

The Pythagorean Theorem and Converse: Applications

The Pythagorean Theorem and its Converse: An Application (Algebra I)

Comparing Linear, Exponential, and Quadratic Functions

Dividing 3 - 4 digit numbers by 2-digit numbers

Dividing 2 -digit by 2 digit with remainder-calculation

Polyhedrons: Examples (Basic Geometry Concepts)

Horizontal and Vertical Asymptotes: An Application (Algebra I)

Chords in Circles: Lesson (Basic Geometry Concepts)

Relating multiplication and division with illustrations

Inscribed Angles in Circles: Examples (Geometry Concepts)

Dividing 2-digit numbers by 2-digit numbers

Perpendicular Bisectors: Examples (Geometry Concepts)

Determining the number of places the decimal point will move after dividing by a power of 10

Variables on Both Sides: An Explanation (Algebra I)

Compare two numbers with an equality or inequality symbol

Trapezoids: Lesson (Geometry Concepts)

Polyhedrons: Lesson (Basic Geometry Concepts)

Find the length of a cube given surface area

Determining unknown angles in trapezoids

Identify a Function from a Table

SSS Triangle Congruence: Examples (Geometry Concepts)

SSS Triangle Congruence: Examples (Basic Geometry Concepts)

SSS Triangle Congruence: Lesson (Geometry Concepts)

Using ratios to solve sum word problems - three terms

Function of Centrioles

Desert Biome

Find area of parallelogram given base and height

SSS Triangle Congruence: Lesson (Basic Geometry Concepts)

Find the area of a triangle - word problems

CK-12 Certified Educator Program - Promo Video

What is an Inequality 1