Common Core Sheets 

Operations and Algebraic Thinking 
Understand subtraction as an unknownaddend problem. 
4. Understand the relationship between numbers and quantities; connect counting to cardinality. 
Example (Hover to Enlarge) 
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Comparing Addition & Subtraction 1oa4
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Find the number that creates an identical problem. 

Subtraction Relative to Addition 1oa4
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Each worksheet has 20 problems relating subtraction to addition.
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