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Neighboring pairs of multiples of 10

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  • Fill the missing number 30, 40, ........, 60
    50
  • Fill the missing number 20, 30, 40, 50, ....., 70
    60
  • Fill the missing number ......, 20, 30, 40, 50
    10
  • Fill the missing number 50, 60, 70, ....., 90, 100
    80
  • Fill the missing number 10, 20, ......, 40
    30
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