In this video, Salman Khan of Khan Academy demonstrates the order of operations.
Khan Academy

6th grade math knowledge map info
StudyStack

Hi I finished a problem can you check it?
Tutor.com

In this video, Salman Khan of Khan Academy demonstrates the order of operations.
Khan Academy

This page starts with a basic description of Algebra and discusses the basic operations, and their order.
The Math Page

This is a virtual video of a whiteboard that explains with examples how to use PEMDAS to perform basic operations.
Math Playground

Definition of the Distributive Rule, with examples and interactive stepbystep solutions of multiple problems
The Math Page

Lesson on the Order of Operations
Math Goodies

These are the properties of multiplication and addition in beginning Algebra.
Basic Number Properties

Nice website with tons of example problems in a tutorial and then a pretest is also available.
Amby's Math Resources
