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  • Recognize the:
    • property of zero in addition, i.e., a + 0 = a
    • property of zero in subtraction, i.e., a – 0 = a
    • commutative property of addition, i.e., a + b = b + a
  • Apply understanding of number properties in doing calculations

– Focusing on the Fundamentals of Math – A Teacher’s Guide, p.5

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