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Australian AMC 2013 - Middle Primary Question 14

AMC AUSTRALIA · Australian AMC 2013 - Middle Primary

Question 14

Given a 2-digit number, a new 3-digit number is formed by putting the digit 1 after it. The new number is
  1. the original number plus 1
  2. ten times the original number plus 1
  3. one hundred plus the original number
  4. one hundred times the original number
  5. one hundred times the original number plus 1