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Addition: Doubles

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  • 4 + ____ = 9
    5
  • 14 + 14 =
    28
  • 8 + 9 =
    17
  • 25 + 25 =
    50
  • 20 + _____ = 41
    21
  • 50 + 50 =
    100
  • 3 + 3 =
    6
  • 4 + 4 =
    8
  • 8 + ____ = 16
    8
  • 5 000 + 5 000 =
    10 000
  • 100 + 100 =
    200
  • 5 + 5 =
    10
  • 9 + 9 =
    18
  • 6 + ____ = 13
    7
  • 30 + 30 =
    60
  • 7 + 7 =
    14
  • 80 + 80 =
    160
  • 6 + 6 =
    12
  • 8 + 8 =
    16
  • 40 + 40 =
    80
  • 60 + 60 =
    120
  • 10 + 11 =
    21
  • 7 + 8 =
    15
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