Math Video: Regrouping Example
In the sample problem, two 3-digit numbers are added together with two regroupings. The demonstration focuses on systematic re-application of the regrouping algorithm to the ones and then the tens. Emphasis is on maintaining the proper distinction between digits of different place values.
Practice worksheets for this type of question can be found here:
Grade 2: Add two 3-digit numbers in columns, with carrying
Grade 3: Adding 3-digit numbers in columns (with regrouping)
Grade 4: Adding 3-digit numbers
