Khan Academy: Arithmetic and Pre Algebra: Points on a Number Line

There are many ways to approach finding the rational approximation of an unknown square root. Here is a problem that will help math learners make a connection between square roots and their order on a number line. As usual, determine two...

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

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

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

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

This video introduces and demonstrates the concept of addition of integers using a number line. Practice problems are available. [5:32]

This video teaches addition and subtraction of negative numbers using a number line. Practice problems are available. [9:16]

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]

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