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Addition and subtraction review

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  • 18-4=?
    14
  • 30-10=?
    20
  • 10-5=?
    5
  • 20-5=?
    15
  • 18+2=?
    20
  • 7+7=?
    14
  • 13+2=?
    15
  • 4-4=?
    0
  • 23-3=?
    20
  • 1+1=?
    2
  • 10+10=?
    20
  • 14-7=?
    7
  • 12+3=?
    15
  • 7+3=?
    10
  • 28+2=?
    30
  • 1-1=?
    0
  • 25-5=?
    20
  • 17+3=?
    20
  • 6+6=?
    12
  • 30-30=?
    0
  • 19+1=?
    20
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