1. Click 2. Click to drag the digits 1 - 9 into the boxes. (You may only use a digit one time.) On page 1: try to make the largest possible sum. On page 2: try to make the smallest possible sum. 3. Use to explain how you solved each, and whether it's the smallest or largest number you could make. 4. Double check your work! 5. Click to submit your answer.
Concept credit to Kathy Rubin.