"

 

 

 

 

 

:

http://www.pashut-heshbon.co.il/146549/%D7%941-%D7%99%D7%97%D7%99%D7%93%D7%94-20

http://www.pashut-heshbon.co.il/146549/%D7%941-%D7%99%D7%97%D7%99%D7%93%D7%94-21

 

http://www.mathbuddyonline.com/common/samplelesson.html 

http://www.youtube.com/watch?v=uX0RXu6NpmQ&feature=relmfu

 
 
 

 

 

  !!!