Common Core Sheets 

Operations and Algebraic Thinking 
Represent and solve problems involving addition and subtraction. 
2. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. 
Example (Hover to Enlarge) 
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Adding Multiple Addends (3 Addends Less than 20) (horizontal) 1oa2
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Each worksheet has 20 problems adding with twenty.
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Adding with Multiple Addends (3 Addends Less than 20) 1oa2
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Each worksheet has 15 problems adding 3 digits. Sum is less than 20.
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3 Addends (Less than 20) Word 1oa2
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Each worksheet has 10 problems adding 3 digits. Sum is less than 20.
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