Khan Academy
Example: Adding Two Digit Numbers (No Carrying)
Adding double-digit numbers can seem difficult for some students. But this Khan Academy video makes this process clear in a developmentally sound way. Students watch as 'Sal' adds the number 46 to 43. He references each number by its...
Khan Academy
Khan Academy: Estimating When Adding Multi Digit Numbers
Use estimation to find reasonable solutions to 2- and 3-digit addition problems.
Khan Academy
Khan Academy: Understand Place Value When Adding Ten
Demonstrates how to add two 2-digit numbers, with no regrouping, using drawings of base ten cubes to represent 1s and 10s. [3:16]
CK-12 Foundation
Ck 12: Elem Math: Overview of Adding and Subtracting 3 Numbers Word Problems
[Free Registration/Login may be required to access all resource tools.] The video shows how to add and subtract three, two-digit numbers.
Khan Academy
Khan Academy: Adding Numbers With Different Signs
Demonstrates how to use a blank number line to add three 2-digit positive and negative numbers. [5:33]
Khan Academy
Khan Academy: Adding 53+17 by Making a Group of 10
Watch as Sal adds 53+17 by breaking apart the numbers and making a group of 10. [3:04]