title: How to find the largest sum and smallest positive difference?
body: <p>Using the numbers 9, 8, 7, 6, 5, and 4 once each, find the following:</p>
  
  <p>a) The largest possible sum</p>
  
  <p>Is there more than on solution that gives the largest possible sum? How do you know it's the largest possible sum?</p>
  
  <p>b) The smallest possible (positive) difference</p>
  
  <p>Is there more than one solution? How do you know it's the smallest possible difference?</p>
  
  <p>The numbers must be 3 digits. For example, 965 + 784 or 879 - 654</p>