Khan Academy
Khan Academy: Adding 3 Digit Numbers (No Regrouping)
Sal visually demonstrates how to add 327 + 251 (without regrouping) using place value. Includes a video, transcript, and question and answer section. [2:39]
Khan Academy
Khan Academy: Subtracting 3 Digit Numbers (No Regrouping)
Sal shows how to subtract 357-251 (without regrouping) using place value. Includes a video, transcript, and question and answer section. [2:56]
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]
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 Subtraction Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video explains two 3-digit addition problems one with regrouping and the other without regrouping.