This art history video discussion examines Paul Cezanne's "The Red Rock," c. 1895, oil on canvas, 91 x 66 cm (Musee de l'Orangerie, Paris).

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 challenge problems - four operations with single units (metric capacities) - word problems.

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

In this video adapted from the Arctic Athabaskan Council, learn how warmer temperatures in the Arctic are transforming the landscape, triggering a host of effects such as permafrost thawing and insect infestations.

This lesson reviews how to change an improper fraction to a mixed number.

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.

In this video art historians Dr. Beth Harris and Dr. Steven Zucker provide a brief overview of Charlemagne and his coronation in 800.

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 10-minute video lesson discusses Carbon 14 Dating (1). [Chemistry playlist: Lesson 105 of 106].

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 choosing the correct unit with liters or milliliters.

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

In this video segment from Cyberchase, the CyberSquad must locate a crystal with the highest fraction of orange color.

This short video and interactive assessment activity is designed to teach third graders about choosing the multiples of a given number up to 12.

This art history video discussion looks at Petrus Christus' "Portrait of a Carthusian", 1446 (Metropolitan Museum of Art).

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 art history video discussion examines Petrus Christus' "Portrait of a Young Woman," c. 1470, oil on oak, 29 x 22.50 cm (Gemaldegalerie, Staatliche Museen zu Berlin).

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 art history video discussion examines Cimabue's "Maesta of Santa Trinita," 1280-1290, tempera on panel, 151 1/2 x 87 3/4" (385 x 223 cm), Uffizi, Florence.

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 art history video discussion examines Claes Oldenburg's "Floor Cake," Synthetic polymer paint and latex on canva filled with foam rubber and cardboard boxes, 58.375 x 114.25 x 58.375 in. (148.2 x 290.2 x 148.2 cm) 1962 (MoMA).

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 give fourth graders an overview of angles.

This short video and interactive assessment activity is designed to teach third graders about classifying all types of triangles by lengths of sides.

This short video and interactive assessment activity is designed to teach fourth graders about classifying all types of triangles by lengths of sides.

This short video and interactive assessment activity is designed to teach third graders an overview of triangle classifications.

This short video and interactive assessment activity is designed to teach third graders about classifying triangles based on equal sides.