Curated Video
Addition Using Base-Ten Blocks (Example)
Adding multi-digit whole numbers using base-ten blocks.
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Addition 3
This video shows several examples of addition with up to four-digit numbers. Practice problems are available. [8:57]
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 4
More practice carrying with multiple digit numbers. This video shows addition of numbers to millions, demonstrating regrouping of numbers and place value.