How to do problem no. 1 from Math Counts School Handbook 2011 2012

Team: 
The Lifes
Topic: General Math
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This video show how to do problem no. 1 from Math Counts School Handbook 2011 2012 easily and understandable.

Common Core Standards: 4.OA.2
Problem #: 
1 (2011-2012)
Problem Difficulty Level: 1 [?]