This short video and interactive assessment activity is designed to teach second graders about more and less (addition and subtraction).

This short video and interactive assessment activity is designed to teach second graders about comparing with two-step addition and subtraction.

The purpose of this task is to foster a classroom discussion that will highlight the difference between multiplicative and additive reasoning.

The purpose of this task is to assess studentsŐ understanding of multiplicative and additive reasoning.

The purpose of this task is to help develop students' understanding of addition of fractions; it is intended as an instructional task.

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Included are the support materials for Grade 2 Blended Learning Math - Unit 5.12: Addition and Subtraction to 100 - Balancing Numbers:
- YouTube video on using addition and subtraction to balance numbers so that they are equal
- Manipulatives and Templates to support Unit 5
- Assessment and Evaluation for Unit 5

Included are the support materials for Grade 2 Blended Learning Math - Unit 5.14: Addition and Subtraction to 100 - Review:
- YouTube video on reviewing what was learned in unit 5 and showing what you know using the strategies
- Manipulatives and Templates to support Unit 5
- Assessment and Evaluation for Unit 5

The purpose of this lesson is to introduce and activate prior knowledge about the topic of whole numbers.

Included is a YouTube video to support Grade 4 Blended Learning Math - Unit 2.0: Whole Numbers - Introduction.

The purpose of this lesson is to add 4-digit numbers.

Included is a YouTube video to support Grade 4 Blended Learning Math - Unit 2.7: Whole Numbers - Adding 4-digit Numbers.

Sal discusses the conditions of matrix dimensions for which addition or multiplication are defined. Created by Sal Khan.

This short video and interactive assessment activity is designed to teach second graders an overview of subtraction (numbers to 1,000).

This short video and interactive assessment activity is designed to teach third graders an overview of subtraction (numbers to 1,000).

This short video and interactive assessment activity is designed to give fourth graders an overview of subtraction (numbers to 1,000).