Khan Academy: Arithmetic and Pre Algebra: Level 2 Addition

This video provides an overview of subtraction. Practice problems are available. [12:32]

This video covers a short review of addition, followed by basic subtraction concepts. Practice problems are available. [8:32]

This video shows how to round a 4-digit number to the nearest ten. Practice problems are available. [1:04]

This video introduces basic addition concepts using objects and number lines to represent and add numbers. Practice problems are available. [7:42]

This video explains the commutative law of addition. Practice problems are available. [1:40]

Use bar graphs to solve addition and subtraction word problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a tutorial video, or receive hints.

Sal solves word problems by adding the same number many times. Includes a video, transcript, and question and answer section. [2:10]

Sal demonstrates the relationship between addition and subtraction using objects. Includes a video, transcript, and question and answer section. [2:05]

Learn what it means to add. The examples used in this video are 1+1 and 2+3. Includes a video, transcript, and question and answer section. [3:10]

Sal solves addition and subtraction equations with number 10 or less. Includes a video, transcript, and question and answer section.