Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Negative Numbers
This video shows addition of negative numbers on a number line, using absolute values. Practice problems are included. [5:41]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Integers With Different Signs
This video introduces and demonstrates the concept of addition of integers using a number line. Practice problems are available. [5:32]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding, Subtracting Negative Numbers
This video teaches addition and subtraction of negative numbers using a number line. Practice problems are available. [9:16]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Decimals of Different Signs
This video shows how to add positive and negative money amounts in the context of a word problem using a number line. Practice problems are available. [3:15]
Khan Academy
Khan Academy: Adding Negative Numbers Example
Demonstrates how to use a blank number line to visualize how to add three 2-digit negative numbers. [5:41]