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Doubles Facts (+1, -1, +10, -10)

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  • Use a doubles fact to solve: 4+5=
    9
  • 3+3=
    6
  • 8+8=
    16
  • Use a doubles fact to solve: 4+3=
    7
  • Use a doubles fact to solve: 10+11=
    21
  • 5+5=
    10
  • Use a doubles fact to solve: 10+20=
    30
  • Use a doubles fact to solve: 8+9=
    17
  • Use a doubles fact to solve: 8+7=
    15
  • Use a doubles fact to solve: 9+10=
    19
  • Use a doubles fact to solve: 6+16=
    22
  • 6+6=
    12
  • Use a doubles fact to solve: 9+8=
    17
  • Use a doubles fact to solve: 4+14=
    18
  • Use a doubles fact to solve: 2+3=
    5
  • 9+9=
    18
  • Use a doubles fact to solve: 6+7=
    13
  • 2+2=
    4
  • 1+2=
    3
  • Use a doubles fact to solve: 1+11=
    12
  • Use a doubles fact to solve: 8+18=
    26
  • Use a doubles fact to solve: 10+9=
    19
  • Use a doubles fact to solve: 7+8=
    15
  • 1+0=
    0
  • Use a doubles fact to solve: 3+4=
    7
  • Use a doubles fact to solve: 2+12=
    14
  • Use a doubles fact to solve: 5+4=
    9
  • Use a doubles fact to solve: 3+2=
    5
  • Use a doubles fact to solve: 3+13=
    16
  • Use a doubles fact to solve: 5+6=
    11
  • Use a doubles fact to solve: 9+19=
    28
  • 10+10=
    20
  • 1+1=
    2
  • 4+4=
    8
  • Use a doubles fact to solve: 7+17=
    24
  • Use a doubles fact to solve: 5+15=
    20
  • 2+1=
    3
  • Use a doubles fact to solve: 6+5=
    11
  • Use a doubles fact to solve: 7+6=
    13
  • 7+7=
    14
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