http://www.xpmath.com/forums/arcade.php?do=play&gameid=59
battleship
http://www.momsminivan.com/battleships1.pdf
With base a power of 10
https://www.youtube.com/watch?v=_jcW-ZgpRbM
With any fraction
https://www.youtube.com/watch?v=do_IbHId2Os
Song:
https://www.youtube.com/watch?v=WV5VY76Pf5U
Math Skills Practice:
http://www.internet4classrooms.com/skills-4th-mathbuilders.htm
http://jc-schools.net/tutorials/interact-math.htm
Multiplication Practice: