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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.OA.D.7

In Grade 1 Standards for Mathematical Practice Operations & Algebraic Thinking Work with addition and subtraction equations
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.