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Section 4.6 Why the Standard Algorithm for Multiplying Whole Numbers Works, Mathematics for Elementary Teachers 4th edition, Beckmann. pg. 189

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Section 3.2 The commutative and Associative Properties or Addition, Mental math, and single-digit facts, Mathematics for Elementary Teachers 4th edition, Beckmann. pg. 110

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Section 1.1 The Counting Numbers, Mathematics for Elementary Teachers 4th edition, Beckmann, pg.11

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It was graded in Peergrade.

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MathCast template with set up- open in EE

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It was graded in peergrade.

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It was graded by a classmate in class.