Elementary Example

Google.com can be used as a calculator.  Type the problem, * for multiplying and / for dividing, and click "Google Search."

Safari Montage offers tons of videos that can introduce or help reinforce content from various subjects. 

Teachers can create an account and assign quizzes to students.  They can also export the grades to Excel.  You also have the ability to see the exact amount of time a student spent on the test.

Students do not have to log in to just practice a skill.

 I don't have enough time to list all of the things that Mathwire has to offer.  Here are just a few examples

Symmetry

100 Day Activities

Morning Math Routines

Fall Activities

Grades K-8

Hundreds of worksheets to reinforce a skill (yeah, I know kill-drill).  You are able to pick a skill and you'll have a page full of problems that you can print out.  They even have some related to holidays.

You can print graph paper.

The have base-ten worksheets as well.

Just like above. 

You have activities at your fingertips.  Great for doing in front of the students or adding as a shortcut to the desktop for the students to use during computer center time.  It is organized by content and grade area.

Pascal's Triangle

Percents

Create a Graph

Create a Budget

Create a Tree Map (Not the Thinking Maps Kind)