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Calculeaza in colonita,apoi efectueaza proba prin operatia inversa.
a)82:5
510:5
203:5
b)67:2
101:2
900:2


Răspuns :

a) 82:5=16 rest 2
    80
    = 2 rest
 

  510:5=102
  5
  =1
  5
  0
  10
  10
   =
  203:5=40 rest 3
  200
  ==3 rest

b) 67:2=33 rest 1
    66
    =1 rest

  101:2= 50 rest 1
  100
  ==1 rest

  900:2=450
  900
  ===