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Addition and Subtraction within 20

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  • 10-8
    2
  • 15-1
    14
  • 8+8=
    16
  • 15-3
    12
  • 6+4
    10
  • 4+7
    11
  • 5+5
    10
  • 12+6
    18
  • 5-1
    4
  • 14-4
    10
  • 8+3
    11
  • 9-7
    2
  • 30+1
    31
  • 6+6=
    12
  • 12-2
    10
  • 10+10
    20
  • 12-6
    6
  • 4+5
    9
  • 3+9
    12
  • 12+6
    18
  • 14+4
    18
  • 20-5
    15
  • 4-4
    0
  • 2+2
    4
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