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addition and subtraction

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  • 15-7=
    8
  • 15-3=
    12
  • 10+10=
    20
  • 3-1=
    2
  • 8+3=
    11
  • 13+2=
    15
  • 6-3=
    3
  • 9-3=
    6
  • 6+5=
    11
  • 1-0=
    1
  • 10-6=
    4
  • 8-5=
    3
  • 7-4=
    3
  • 7+3=
    10
  • 12-9=
    3
  • 4+5=
    9
  • 10-2=
    8
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