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Subtraction and addition

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  • 13-8 = ?
    5
  • 20-10 = ?
    10
  • 10+6 = ?
    16
  • 12-8 = ?
    4
  • 11-3 = ?
    8
  • 1+3 = ?
    4
  • 9+6 = ?
    15
  • 11+7 = ?
    18
  • 13+6 = ?
    19
  • 3+6 = ?
    9
  • 7-3 = ?
    4
  • 15+5 = ?
    20
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