Examine the scope of the opioid addiction crisis in America and strategies, including harm reduction programs, that are being used to treat people with opioid use disorder in these videos from NOVA: Addiction. Explore harm reduction programs designed to stop preventable deaths and new disease outbreaks that reflect a public health approach to improve current treatments-by understanding addiction as a disease, not a stigmatized or criminal behavior. [4:21] Support materials are provided.

Meet Cade, a high school hockey player, and learn how his addiction to nicotine from vaping has had physical and behavioral impacts on his life in this digital video from NOVA. Use this resource to stimulate thinking and questions about the consequences of addiction and provide opportunities for students to make evidence-based claims about the health effects of vaping on teens. [3:59] Support materials are provided.

Demonstrates how to add 23 to 45 using drawings of base ten cubes to represent 1s and 10s. [2:34]

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 adding 3 numbers - word problems.

Sal adds 53+17 by breaking apart the numbers and making a group of 10. [3:35]

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.

Shows how to add three 1-digit numbers by combining two numbers then the third in three different ways. [2:37]

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.

Demonstrates how to count pieces of fruit and make a group of ten to find the sum of 8 + 7. [3:18]

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 adding capacities in compound units (english units).

This short video and interactive assessment activity is designed to teach fourth graders about adding decimals - word problems.

Sal uses an understanding of place value to add decimals, such as 0.68+0.33. [6:56]

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.

Demonstrates how to add two fractions where the denominators are 10 and 100. [4:25]

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.

Sal solves a word problem by adding mixed numbers with unlike denominators. [5:46]

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.

Video explains how to solve a word problem about paint by adding mixed numbers with unlike denominators. [5:46]

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.

People using crutches have their hands occupied, which makes it difficult to carry books and other items they want to have handy. Student teams are challenged to design assistive devices that modify crutches to help people carry things such as books and school supplies. Given a list of constraints, including a device weight limit and minimum load capacity, groups brainstorm ideas and then make detailed plans for their best solutions. They create prototypes and then test for functionality by loading them and using them, making improvements with each iteration. At a concluding design expo, teams present their concepts and demonstrate their final prototype devices.

Demonstrates how to add two mixed numbers by adding the whole numbers separately and then finding the least common denominator for the fractions and adding those. The sum of the fractions is then simplified. [2:20]

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.

Demonstrates how to add two mixed numbers, where the fractions have the same denominator, by adding the whole numbers together and then the fractions. [1:34]

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.

Sal simplifies a polynomial addition expression. [2:00]

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.

Practice solving addition and subtraction problems with integers (positive and negative numbers). Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

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.

Demonstrates with the help of a number line how to add and subtract 1-digit negative numbers. [4:06]

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.