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Addition equations
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how to check your answers in addition - YouTube
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Mathematics - Addition and Subtraction - The relation between addition
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Addition and Subtraction of Similar Fractions | MATH LOVER
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Checking Subtraction with Addition - Math Foundations
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Check for Subtraction and Addition | Relating Addition and Subtraction
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Lesson Video: Addition Equations | Nagwa
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Video #12 - Using Addition to Check Subtraction - YouTube
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Addition equations
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Solving Equations Using the Addition Principle - Lesson | Study.com