DIVISION BY ONE DIGIT NUMBER-170a
    _____
 5 ) 22    ESTIMATE BY MULTIPLICATION  5x2=  10
                                       5X3=  15
    __4__                              5X4=  20  
 5 ) 22                                5X5   25  TOO BIG SO 4 IS THE ESTIMATE
     20
    ---
      2  WITH A REMAINDER OF 2  ANSWER IS 4 R2



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