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3.OA.D.9 Common Core Games, Videos, Lessons, Worksheets, and Quizzes
CCSS.Math.Content.3.OA.D.9:
Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.
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