Curated Video
Commutative and Associative Properties
Mr. Addit reviews the terms commutative property and associative property and shows examples of each.
Curated Video
Addend, Sum, and Plus
Mr. Addit reviews the terms addend, sum, and plus. He then provides three methods for finding the missing addend in an addition sentence.
Curated Video
Review for You: Addition and Function Tables
Mr. Addit reviews addition and the use of function tables.
Curated Video
Adding with Number Lines: A Step-by-Step Guide
In this video, students learn how to add using a number line. The teacher explains the concept of decomposing numbers and demonstrates how to add by counting on the number line. Two examples are provided, to reinforce the concept of...
Curated Video
Writing Equivalent Expressions using Identity Properties
This video explains the additive identity property of 0 and the multiplicative identity property of 1. The examples demonstrate how adding 0 or multiplying by 1 does not change the value of a number or expression. The video also shows...
Curated Video
Solving Unknown Amounts Using Addition and Subtraction Fact Families
The video demonstrates how to solve for unknown amounts using addition and subtraction fact families. The teacher explains the concept of fact families and how they can be represented in a triangle. The video provides examples of how to...
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition (Sums to 1,000)
[Free Registration/Login may be required to access all resource tools.] Video demonstrating how to add two 3-digit numbers vertically with no regrouping. [1:04]