Some lovely interactive number grids.

1-100
http://www.oswego.org/ocsd-web/games/SplatSquares/splatsq100.html

0-99
http://www.oswego.org/ocsd-web/games/SplatSquares/splatsq99.html

1-100 Reveal
http://www.oswego.org/ocsd-web/games/SplatSquares/splatre100.html

0-99 Reveal
http://www.oswego.org/ocsd-web/games/SplatSquares/splatre99.html