two thirds in percentage is 66.666666666666666 (goes on forever)
http://wiki.answers.com/Q/What+is+the+percent+for+...

About 66%. Thanks for using ChaCha!
http://www.chacha.com/question/whatisthepercent...

To figure out what is one half of two thirds I convert it to decimals. Two thirds is .666 and 1/2 is .5. Then I take .666 and multiply it by .5. The answer is .333 or 1/3.
http://answers.ask.com/Health/Diseases/what_is_one...

1. Type in two divided by three and press the equals sign on your calculator. You should receive a decimal similar to 0.666. repeating. 2. Press the multiplication sign and type in
http://www.ehow.com/how_7359493_calculatetwothir...
