CK-12's Grade 4 Elementary Math is a series of videos and interactive videos designed to teach basic math concepts to 4th graders. Concepts covered include Addition and Subtraction, Multiplication and Division, Multiple Operations and Grouping, Place Value, Decimals, Time, Money, Measurement, and Geometry.

CK-12's Grade 5 Elementary Math is a series of videos and interactive videos designed to teach basic math concepts to 5th graders. Concepts covered include Multiplication and Division, Place Value, Multiple Operations and Grouping, Decimals, Time, Fractions, Money, Measurement, and Geometry.

Celebrate National Periodic Table Day (February 7) with us! This week on Live Science, we will be talking about the process of discovering, or creating, new elements. So far, Berkeley Lab has helped discover 16 elements on the periodic table! Are we close to finding another

This video segment, adapted from NOVA, describes the energy flow in a coral reef, including its food web.

On NOVA, a team of carpenters, timber framers, engineers, and historians recreate a medieval throwing machine called a trebuchet. This adapted video segment explores how understanding energy transfer informs their design.

What does it take to engineer a magnet smaller than any other? Berkeley Lab scientist Jie Yao will talk to us about his team's recent creation of the first-ever 2D magnet: a material that is magnetic at only one atom thick! We'll discuss what went into this remarkable achievement, hear what fields and industries it will affect, and see some magnetism demos in action.

In this video segment from NASA, robotics researcher Ayanna Howard uses engineering to improve the intelligence of robots in space exploration.

This art history video discussion examines the Equestrian Sculpture of Marcus Aurelius, bronze, c. 173-76 C.E., (Capitoline Museums, Rome). The original location of the sculpture is unknown though it had been housed in the Lateran Palace since the 8th century until it was placed in the center of the Piazza del Campidoglio by Michelangelo in 1538. The original is now indoors for purposes of conservation. Marcus Aurelius ruled 161-180 C.E.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

This short video and interactive assessment activity is designed to teach second graders an overview - equivalent decimals ending in zero.

This short video and interactive assessment activity is designed to give fourth graders an overview of - equivalent decimals ending in zero.

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

This art history video discussion examines the Caryatid (South Porch) and Ionic Column (North Porch), Erechtheion on the Acropolis, Athens, marble, 421-407 B.C.E. (British Museum, London). Mnesicles may have been the architect.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

This short video and interactive assessment activity is designed to teach fourth graders about estimating measure by image: centimeters or meters?.

This short video and interactive assessment activity is designed to teach fifth graders about estimating the measure of objects by image: feet or inches?.

Franklin works with Laverne to create a budget for a job painting a room, in this video segment from TV 411.

This short video and interactive assessment activity is designed to teach fourth graders about estimating measure by description - multiple choice.

Harry estimates how long it will take him to get to the front of a long ticket line in this Cyberchase video segment.

This short video and interactive assessment activity is designed to teach fifth graders about estimating the measure of items by description: inches, feet, or yards?.

Acerca de este video: Esta animación describe la estructura de una célula procariota y el modo en que se altera para permitir que se produzca la fisión binaria.

Esta animação descreve a estrutura de uma célula procariótica e como ela é alterada para permitir que a fissão binária ocorra.