Divisibility Rules
  • A nine-digit number consists of each digit from 1 to 9. The nine-digit number is therefore divisible by 9. If you remove the rightmost digit, the remaining eight-digit number will be divisible by eight. If you remove the next rightmost digit, the remaining seven-digit number will be divisible by 7. If you remove the next rightmost digit, the remaining six-digit number will be divisible by 6. This process continues to one. What is the original nine-digit number?

Answer:    
  Please enter a numerical answer
(ex. 1000 or 2.033) and click GO.		    

Contest problems and answers provided by:

David Rock
rock_david@colstate.edu
Columbus State University

Doug Brumbaugh
brumbad@pegasus.cc.ucf.edu
University of Central Florida