Question : You know of quality and free speed math references?

Hi everyone,

  Do you know of the best online materials such as websites or computer games, ebooks , or hard copy books about speed math? I would prefer those that are free to use but very much informative  :D Thanks in advance

Answer : You know of quality and free speed math references?

Here are several URLs which are related to your question
Trachtenberg Speed Math: Learn mental math and master mathematics ...
Trachtenberg Speed Math software based on Jakow Trachtenberg's speed math algorithms developed during WW II while imprisoned in Nazi camps.
www.speed-math.com/ -

Amazon.com: Speed Mathematics: Secret Skills for Quick Calculation ...
Start reading Speed Mathematics: Secrets Skills for Quick Calculation on your Kindle in .... Speed Math for Kids: The Fast, Fun Way To Do Basic Calculations ...
www.amazon.com › ...

Books for speed math
Speed Mathematics Simplified - Edward Stoddard - 1994 - 308 pages
Speed Mathematics Using the Vedic System - Vali Nasser - 2004 - 228 pages
Speed Math for Kids: The Fast Fun Way to Do ... - Bill Handley - 2007 - 258 pages