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Tính nhẩm siêu tốc

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  • 1 000 - 300 =?
    700
  • 90 - 40 =?
    50
  • 50 + 40 =?
    90
  • 500 + 400 =?
    900
  • 80 + 20 =?
    100
  • 1 000 - 700 =?
    300
  • 100 - 20 =?
    80
  • 90 - 50 =?
    40
  • 300 + 700 =?
    1 000
  • 100 - 80 =?
    20
  • 900 - 500 =?
    400
  • 900 - 400 =?
    500
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