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Subtraction to 20

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  • 17-2
    15
  • 12-5
    7
  • 14-3
    11
  • 9-4
    5
  • 8-3
    5
  • 18-4
    14
  • 13-9
    4
  • 11-5
    6
  • 12-2
    10
  • 20-4
    16
  • 15-8
    7
  • 18-9
    9
  • 10-6
    4
  • 6-3
    3
  • 11-11
    0
  • 15-5
    10
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