inmultirea cu 2

http://www.math-play.com/multiplication-game-times-table-2/multiplication-game-times-table-2.html
http://www.mathsisfun.com/quiz/twotimes.html
http://www.what2learn.com/home/examgames/maths/subtraction/
http://www.amblesideprimary.com/ambleweb/mentalmaths/tabletrees.html
http://www.maths-games.org/two-times-table-shooter.html