Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to and make the greatest/least product.

### Hint

Which numbers should we use? Which numbers should we not use?

### Answer

Greatest: (9-2)(8-1)

Source: Nanette Johnson

Smallest:

Subtract the numbers that are next to each other. That will get you to the product of 1.

Example: (9-8)(7-6) = 1×1=1

Least: from Srihaas A in Mrs. Kinney’s Class (9-2) (1-8) = -49

Least:

(1-9)(8-2) = -56

(1-9)(8-2)=56

(9-8)

(7-1)