Khan Academy: Arithmetic and Pre Algebra: Adding, Subtracting Negative Numbers

Guiding viewers through adding and subtracting numbers, this video includes many tips to help new learners internalize the concept of a number line. It clarifies the relationship between positive and negative numbers, including the...

This video shows how to plot fractions, negative numbers, decimals, and fractions on a number line. Practice problems are available. [1:58]

This video shows ordering of negative numbers by relating them to their positions on a number line. Practice problems are available. [2:47]

This video shows addition of negative numbers on a number line, using absolute values. Practice problems are included. [5:41]

This video shows how to think about and represent negative numbers using a number line. Practice problems are available. [9:36]

This video shows how to add three fractions, one of which has a negative sign. Practice problems are available. [6:22]

A video explaining the meaning of exponents and exponential notation. Practice problems are available. [9:46]

This video demonstrates how to find the base number when given a percentage and amount. Practice problems are available. [6:17]

This video introduces and explains the concept of ratios through a number of examples. Practice problems are available. [14:13]

This video shows how to find a unit rate in the context of a word problem. Practice problems are available. [2:31]