Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Level 2 Addition
A video explaining addition of a two-digit number and a one-digit number using the addition algorithm, objects and number lines. Practice problems are available. [9:47]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Addition 4
This video shows addition of numbers to millions, demonstrating regrouping of numbers and place value. Practice problems are available. [8:49]
Khan Academy
Khan Academy: Addition With Carrying: Addition 3
This video shows several examples on carrying digits to add multiple digit numbers.
Khan Academy
Khan Academy: Addition With Carrying: Addition 4
More practice carrying with multiple digit numbers. This video shows addition of numbers to millions, demonstrating regrouping of numbers and place value.