http://www.vrml.k12.la.us/smbodin/lacue_necc/necc09/centers/readingcenters.htm
Math Centers and Math Resources
http://www.techatschool.com/math_centers.htm
This one explains the task of getting activities organized and running:
http://www.3rdgradethoughts.com/2013/02/math-rotations-math-centers.html#.UiOLb7-RC0s
Scroll all the way down to a Math Pockets and check this one out:
http://www.ourclassweb.com/sites_for_teachers_learning_centers_math.htm
Ways and pictures to organize all the activities:
http://www.3rdgradegridiron.com/2012/04/math-centers-linky-party.html
More ways to make it work:
http://funin4b.blogspot.com/2012/04/math-stationsmaking-it-work.html
Another picture of how to make this work:
http://learningwithmrss.com
Free File Folder Games:
http://www.filefolderfun.com/ThirdGradeMath.html
Grade 2 Activities
http://michelle-davis.blogspot.com/2011/10/we-have-already-covered-following-math.html
Free Math Drill Worksheets
http://www.busyteacherscafe.com/printables/math.html
Third Grade Number Activities
http://www.k-5mathteachingresources.com/3rd-grade-number-activities.html
3-5 Math Resorces
http://mathlearnnc.sharpschool.com/cms/One.aspx?portalId=4507283&pageId=5051238
