Smart Board - Use Order of Operations to play connect four. http://www.shodor.org/interactivate/activities/OrderOfOperationsFou/?version=1.6.0_07&browser=MSIE&vendor=Sun_Microsystems_Inc.
Order of Operations Quiz - Choose your level and race against the clock to solve as many numerical expressions as possible. http://www.shodor.org/interactivate/activities/OperationsQuiz/
Place Value - Race against the clock to write numbers in standard form when given the word form. http://www.aaamath.com/B/g6_31_x1.htm
Place Value http://www.aaamath.com/B/g6_41ax2.htm
Sixth Grade Math Activities http://www.internet4classrooms.com/skills_6th_original.htm