CK-12 Algebra Explorations is a hands-on series of activities that guides students from Pre-K to Grade 7 through algebraic concepts.

CK-12 Foundation's Algebra FlexBook is an introduction to algebraic concepts for the high school student. Topics include: Equations & Functions, Real Numbers, Equations of Lines, Solving Systems of Equations & Quadratic Equations.

This short video and interactive assessment activity is designed to teach second graders an overview of am and pm.

This short video and interactive assessment activity is designed to give fourth graders an overview of classification of angles.

This short video and interactive assessment activity is designed to give fourth graders an overview of measurement of angles.

This short video and interactive assessment activity is designed to teach fifth graders about total distance without unit conversion (metric units).

This short video and interactive assessment activity is designed to teach fourth graders about calculating distance in meters.

This short video and interactive assessment activity is designed to teach fourth graders about time and rate problems.

This short video and interactive assessment activity is designed to teach fifth graders about total length - challenge problems.

This short video and interactive assessment activity is designed to teach fourth graders about determining task length.

This short video and interactive assessment activity is designed to teach fifth graders about adding and subtracting lengths (metric units).

This short video and interactive assessment activity is designed to teach third graders about creating largest and smallest numbers given digits.

This short video and interactive assessment activity is designed to give fourth graders an overview of composite figures composed of squares and rectangles.

This short video and interactive assessment activity is designed to teach third graders about area in grid.

This short video and interactive assessment activity is designed to give fourth graders an overview of area and perimeter of rectangle.

This short video and interactive assessment activity is designed to teach fourth graders about arranging numbers in specific order (numbers to 1,000).

This short video and interactive assessment activity is designed to teach third graders about arranging numbers in specific orders.

This short video and interactive assessment activity is designed to teach fourth graders about arranging and ordering capacities (english units).

CK-12 Basic Physics - Second Edition updates CK-12 Basic Physics and is intended to be used as one small part of a multifaceted strategy to teach physics conceptually and mathematically.

This short video and interactive assessment activity is designed to teach third graders an overview of lines, curves, vertices, and sides of 2d shapes.