Adding Decimals Using a Number Line

This lesson teaches how to represent decimal addition on a number line. It starts with a number line from 0 to 1, divided into 10 parts, each representing 1/10. The video demonstrates adding 3/10 and 5/10, resulting in 8/10. It then shows adding 8/10 and 4/10, requiring an extension of the number line to 2, resulting in 1 and 2/10. The lesson concludes with a summary of the concepts covered.

Describe the process of extending the number line to add 4/10 to 8/10.

What is the final sum of 8/10 and 4/10 after extending the number line?