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Introduction to regrouping

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  • What is the answer to the shaded in box?
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  • What is the answer?
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  • What is the answer to the shaded in box?
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  • What is the answer to the shaded in box?
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  • What is the answer to the shaded in box?
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  • What is the answer to the shaded in box?
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  • What is the answer to the shaded in box?
    x
  • What is the answer?
    x
  • What is the answer?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer?
    x
  • What is the answer?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer to the shaded in box?
    x
  • What is the answer to the shaded in box?
    x