First Name          =Jüri
Last Name           =Kurvits
Title               =
Institution         =Tallinn University / University of Helsinki
Street Address      =Narva mnt 25
City                =Tallinn
State               =Estonia
Zip Code            =10120
Telephone           =37251992132
FAX                 =
E-mail              =jkurvits@tlu.ee
URL                 =
Title of talk       =Operations with Rational Numbers In Grades 5 to 7