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Special Numbers

My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?

Your Number Is...

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

First Forward Into Logo 6: Variables and Procedures

Learn to write procedures and build them into Logo programs. Learn to use variables.

Your Number Was...

Age 11 to 14
Challenge Level


One way to begin thinking about this is to collect together some outputs and their corresponding inputs:
 
 Finishing Number   Starting Number 
   
   
   
   
   


Can you write each step of the machine's instructions as a function machine?
What happens if you work backwards?