Gifted and Talented - D. Carlson

Order Of Operations Introduction*
http://www.learnalberta.ca/content/mejhm/html/object_interactives/order_of_operations/use_it.html

Practice basic order of operations
http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/order.shtml

Practice Order of Operations
http://www.aaamath.com/g82-order-of-operations.html

Practice with exponents and parentheses
http://www.shodor.org/interactivate/activities/OrderOfOperationsFou/