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

A complete introduction to scientific investigation and the scope of physical science. Includes: states of matter, atoms, periodic table, chemical bonding, chemical reactions, carbon chemistry, chemistry of solutions, nuclear chemistry, motion, forces, Newton's Laws of Motion, work and machines, energy, waves, sound, electromagnetic radiation, visible light, electricity, and magnetism.

The CK-12 21st Century Physics FlexBook is a collaborative effort of the Secretaries of Education and Technology and the Department of Education that seeks to elevate the quality of physics instruction across the Commonwealth of Virginia.

This short video and interactive assessment activity is designed to teach fourth graders about four operations - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding, subtracting, multiplying and dividing - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding and subtracting with parentheses ii.

This short video and interactive assessment activity is designed to teach fourth graders about adding, subtracting, and multiplying with parentheses - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about placing the missing parentheses to make the equation true.

This short video and interactive assessment activity is designed to teach fourth graders about placing the missing parentheses to make the equation true.

This short video and interactive assessment activity is designed to teach second graders an overview - thousandths.

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

This short video and interactive assessment activity is designed to teach fourth graders about using both division and multiplication - word problems.

This short video and interactive assessment activity is designed to teach third graders about finding the amount of change - multiplication.

This short video and interactive assessment activity is designed to teach third graders about place value problems involving money.

This resource gives information about our solar system which is made up of the sun, planets and all the amazing objects that travel around it. Information about the plant sizes, distances in the solar system and the size and shape of orbits is also explained. The universe is filled with billions of star systems. And the star system we are most familiar with is our own.

This short video and interactive assessment activity is designed to teach third graders about prime factorization.

CK-12 Foundation's new and improved Advanced Probability and Statistics-Second Edition FlexBook introduces students to basic topics in statistics and probability, but finishes with the rigorous topics an advanced placement course requires.

CK-12 Advanced Probability and Statistics introduces students to basic topics in statistics and probability but finishes with the rigorous topics an advanced placement course requires. Includes visualizations of data, introduction to probability, discrete probability distribution, normal distribution, planning and conducting a study, sampling distributions, hypothesis testing, regression and correlation, Chi-Square, analysis of variance, and non-parametric statistics.

CK-12 Advanced Probability and Statistics Teacher's Edition provides tips and enrichment activities for teaching CK-12 Advanced Probability and Statistics Student Edition. The solution and assessment guides are available upon request.