Grade 6 - Useful Links:

Rounding of numbers:
http://www.quia.com/hm/41141.html
http://www.brainingcamp.com/resources/math/rounding/applications.php (Application questions on rounding)  

Squares:
http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=4&A3=0      
http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=9&A3=0

Square roots:
http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=17&A3=0    
http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=24&A3=0

Sequences and Patterns:
http://nlvm.usu.edu/en/nav/frames_asid_185_g_2_t_1.html?from=grade_g_2.html
http://www.bbc.co.uk/schools/ks2bitesize/maths/number/number_patterns/play.shtml
http://www.funbrain.com/cracker/index.html
http://www.mathsframe.co.uk/sequences.swf
http://www.bbc.co.uk/schools/ks2bitesize/maths/number/number_patterns/play_popup.shtml

Addition of integers:
http://nlvm.usu.edu/en/nav/frames_asid_161_g_2_t_1.html
http://nlvm.usu.edu/en/nav/frames_asid_122_g_2_t_1.html?open=instructions&from=grade_g_2.html
http://www.basic-mathematics.com/adding-integers-game.html

Subtraction of integers:
http://www.xpmath.com/forums/arcade.php?do=play&gameid=49
http://www.xpmath.com/forums/arcade.php?do=play&gameid=18

Multiplication of integers:
http://www.berghuis.co.nz/abiator/maths/sa/saintegermultiply.html
http://www.brainingcamp.com/resources/math/integer-multiplication

Division of integers:
http://www.berghuis.co.nz/abiator/maths/sa/saintegerdivision.html

Mixed operations on integers:
http://www.dositey.com/2008/addsub/Mystery11.htm#s
http://amby.com/educate/math/integ_x1.html