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Adding numbers

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  • 11 + 5 = ?
    16
  • 13 + 20 = ?
    33
  • 10 + 10 = ?
    20
  • 12 + 5 = ?
    17
  • 9 + 10 = ?
    19
  • 15 + 5 = ?
    20
  • 20 + 20 = ?
    40
  • 7 + 2 = ?
    9
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