Topic 2 Vocabulary

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Across
  1. 2. _______ operations are operations that can undo one another.
  2. 4. a placeholder for an unknown number.
  3. 5. ________ Property of Addition is when changing the order of addends does not change the sum.
  4. 7. a way of adding or taking away numbers that you find easier.
Down
  1. 1. ________ Property of Addition is when the sum of three or more numbers remains the same regardless of how the numbers are grouped.
  2. 3. a step-by-step process to solve a particular problem.
  3. 6. ________ Property of Addition is when you add zero to any number, it equals the number itself.