Скачать или смотреть Common Core Math 6th & 7th Grade Subtraction of rational numbers as adding the additive inverse:

This video demonstrates how to teach Subtracting Integers with zero pair. See ways to use a zero pair to teach subtracting integers and understand rational numbers. See how to help your students make sense of integers without counters and understanding the zero pair.
Middle school math rational numbers. CCSS.MATH.CONTENT.7.NS.A.1.C Understand subtraction of rational numbers as adding the additive inverse, p - q = p + (-q).

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