επανάληψη στον πολ/σμο

http://phet.colorado.edu/sims/arithmetic/arithmetic_en.html

https://www.mathplayground.com/grade_3_games.html

https://www.mathsisfun.com/tables.html

https://podilato98.blogspot.com/2015/06/xionopropaideia-paixnidi.html

http://www.learnyourtables.co.uk/gk/index2.htm

http://www.jele.gr/activity/c/math/mathC061.swf

και διαίρεση
https://fun4thebrain.com/Division/superherocostumediv.html