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find parts of 11,12 and 13

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    find parts of 11,12 and 13
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  • 12 = 10 + _
    2
  •  15
  • 13 = 10 + _
    3
  •  15
  • 11 = 10 + _
    1
  •  15
  • 12 = _ + 2
    10
  •  15
  • choose
    13
  •  15
  • write the equation
    _ = _ + _
  •  15