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Adding to 10-15 20

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  • 20+0
    20
  • 15+5
    20
  • 6+4
    10
  • 10+5
    15
  • 9+1
    10
  • 8+7
    15
  • 6+14
    20
  • 14+1
    15
  • 10+10
    20
  • 10+0
    10
  • 15+0
    15
  • 19+1
    20
  • 5+5
    10
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