Resources and Tools for Elementary Math Specialists and Teachers
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      Equally important
      By Uncle Bob on 08/21/2012 - 14:26
    • The misuses and misunderstandings of the equal sign cause many of the errors in arithmetic, and yet the use of symbol per se is rarely taught. What are the properties of equivalence that make this OK: 17 = 9 + 8, and this: 3+6+1 = 10; and yet make this wrong: 3X5 = 15+6 = 21? Some helpful activities are provided here.