5ieme
http://www.math-play.com/rounding-numbers-pirate/rounding-numbers-pirate.html
http://pbskids.org/cyberchase/media/games/ballparkestimation/ballparkestimation.html
http://www.funbrain.com/tens/index.html
6ieme:
http://www.coolmath-games.com/0-math-lines-xfactor/
http://www.mathplayground.com/multiples.html (choississez des multiples difficiles, comme 6, 7, ou 8)
http://www.softschools.com/math/factors/factor_tree/
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