Math Lab: Casting Out Nines - Tech Learning

Math Lab: Casting Out Nines

Learn this diabolically easy procedure, called casting out nines, right here.
Publish date:

How do you feel about checking your work after you’ve labored for minutes solving a mathematical problem? Learn this diabolically easy procedure, called casting out nines, right here. Do the problems presented, and learn the password that will take you to the treasure page. This method of checking math calculations is included in Quick and Easy Mathematics, a book written by science fiction author Isaac Asimov.

courtesy of Knovation



The Nine Planets

Name: The Nine Planets Brief Description of the Site: With the successful landing on Mars of the rovers Spirit and Opportunity most of the focus is on the Red Planet itself. But what about Phobos and Deimos? They are the two moons orbiting Mars, as we learn from this comprehensive and scholarly site dedicated to

Way Out!

Way Out! Can you help a cow plot a path out of the Milky Way? This cute space game is for all ages and is offered by HubbleSite. Users may pick their level of expertise and can choose from novice, pretty smart about space, or an astrobrainiac. Hubblesite • Learning Games •

Plane Math Activities

Plane Math Activities Here at Plane Math you can use your skills to solve problems related to air travel. Help the pilot find the best "Flight Path" for the shortest route cross-country, or figure out when your favorite rap group is landing. Fun graphics lead students through nine different

The Little Rock Nine: 50 Years Later

The Little Rock Nine: 50 Years Later See current portraits of seven of the Little Rock Nine and listen to remembrances of their experiences as the first African Americans to enroll in the previously segregated Central High School in Little Rock, Arkansas in 1957. New York Times

We have a winner: meet our 1000th Twitter follower promo image

Nine Reasons to Twitter in Schools

Why should educators get involved with Twitter? Here are nine reasons. 1. Together we’re betterTwitter can be like a virtual staffroom where teachers can access in seconds a stream of links, ideas, opinions, and resources from a hand picked selection

Franklin's Lab

Name: Franklin's Lab Brief Description of the Site: Designed by a student of Interactive Media in England, this site is aimed at children in learning the basic principles of science. It provides tutorials, drills, and a test. The animated character of Benjamin Franklin brings it all together and hosts and

Dressed to the Nines, A History of the Baseball Uniform

Dressed to the Nines, A History of the Baseball Uniform An exhibit from the Baseball Hall of Fame traces the evolution of the baseball uniform and accessories from the early 1800s. The site includes a searchable database of uniforms and teams as well as providing educational activities. National

Matisse Cut-Outs

Matisse Cut-Outs Celebrate the birthday of artist Henri Matisse with this site that provides a simple, fun game for young learners. Students can create a design inspired by his work. Players learn about layering and manipulating shapes and other elements of art and design. PBS •