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Soma e subtração mental

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    30
  • 10+10+10
    30
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    20
  • 45-15
    30
  • 5x2
    10
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    18
  • 90-40
    50
  • 33-10
    23
  • 4x4
    16
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    40
  • 9x1
    9
  • 19-7
    12
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    50
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    22
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    12
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  • 2x8
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    30
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  • 2x2
    4
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