τριβή

https://www.slideshare.net/xristoasxar/97-75814399

http://atheo.gr/yliko/fe/pdf/9,5.pdf

ΕΚΦΕ
https://ekfechanion.eu/yliko/dimotiko/staxi.html

μαθηματικά
http://inschool.gr/G6/MATH/DIERESI-ATELI-PRAC-G6-MATH-HPclickon-1310072126-tzortzisk/index.html

http://inschool.gr/G6/MATH/DIERESI-TELEIA-PRAC-G6-MATH-HPclickon-1310072127-tzortzisk/index.html

http://inschool.gr/G6/MATH/PARASTASEIS-SEIRA-PRAC-G6-MATH-MYmillion-1310022128-tzortzisk/index.html

http://inschool.gr/G6/MATH/PARASTASEIS-SEIRA-PRAC-G6-MATH-MYmillion-1310022127-tzortzisk/index.html