This book is a "flexed" version of CK-12's Basic Geometry that aligns with College Access Geometry and contains embedded literacy supports. It covers the essentials of geometry for the high school student.

CK-12 Foundation's Geometry FlexBook is a clear presentation of the essentials of geometry for the high school student. Topics include: Proof, Congruent Triangles, Quadrilaterals, Similarity, Perimeter & Area, Volume, and Transformations.

This short video and interactive assessment activity is designed to teach second graders about capacity comparison problems with illustrations - word problems.

This short video and interactive assessment activity is designed to teach third graders an overview of capacity IIi (metric units).

This short video and interactive assessment activity is designed to teach second graders about capacity problems with illustrations - word problems.

In this activity, the students will demonstrate the ability to represent numbers in scientific notation and use geometry to solve problems about planets in the solar system.

Definition of Cavalieri’s Principle as it applies to two and three dimensional objects, with image examples.

This short video and interactive assessment activity is designed to teach fifth graders about challenging multi-step money problems.

This is an interactive lesson plan with videos, questions, and activities pertaining to area, surface area, and volume. It is a fun and engaging activity in which students pretend they are renovating their bedrooms and have to figure out how much of a material to by based on area measurments.

This short video and interactive assessment activity is designed to teach fifth graders about choosing the correct unit with liters or milliliters.

This task is primarily about volume and surface area, although it also gives students an early look at converting between measurements in scale models and the real objects they correspond to.

This short video and interactive assessment activity is designed to teach fifth graders about coins and bills.

This short video and interactive assessment activity is designed to teach second graders about making observations about capacity (metric units).

This short video and interactive assessment activity is designed to teach second graders about comparing the capacity by formula in quarts, pints and cups.

This short video and interactive assessment activity is designed to teach second graders about comparing gallons and quarts by pictures.

This short video and interactive assessment activity is designed to teach fifth graders about multiple object lengths (english units).

This short video and interactive assessment activity is designed to teach second graders about comparing gallons, pints, and quarts by formula.

This short video and interactive assessment activity is designed to teach second graders about comparing capacity with pictures (english units).

This short video and interactive assessment activity is designed to teach third graders an overview of conversion among units of measure.

This short video and interactive assessment activity is designed to teach third graders about comparing cups and pints by formula.