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An Instructional Module on Two-Digit Number Subtraction  Designed by Tanja Galetti   July 1, 2011 CIMT 620 Instructional Design - Project F: Instructional Material Production - Instructor: Xiaoxia Silvie Huang (Image source: http://atssportsblog.com/wp-content/uploads/2009/05/mission_impossible_logo.gif)