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Use a number line to jump ahead however many places are needed to complete the addition problem.

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Line the numbers up vertically, add up the ones, underneath add up the tens, then add the two sums together.

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Break down the addends into groups of tens and groups of ones. Add up the tens together, then add up the ones. Once finished add up the sum of the tens plus the sum of the ones.

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Line up the numbers vertically.  Align the ones an tens under each other.
Add the ones regroup if necessary then add up the tens to receive the sum.

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Cargo Security - Addition Math Game Content Skill: Addition &nbsp; &nbsp; &nbsp; &nbsp; Common Core State Standards: CCSS.Math.Content.2.OA.B.2 - Fluently add within 20

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Aquatic Speedway - Addition Math Game Content Skill: Addition &nbsp; &nbsp; &nbsp; &nbsp; Common Core State Standards: CCSS.Math.Content.2.OA.B.2 - Fluently add within 2

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This strategy

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Addition: combing two numbers(addends)  together to get a sum
4+5=9

Addend: A number that is added to a number
4+5=9

Sum: The answer to the addition problem
4+5=9

Commutative Property of Addition: the order of the addends does not change the sum of the two numbers.