Open Middle®
Directions: Using the integers -9 to 9, at most one time each, place an integer in each box twice to make a positive product and a negative product. You may reuse all the integers each product.
Hint
How does the base affect whether the product is positive or negative? How does the exponent affect whether the product is positive of negative?
Answer
There are many possible answers including 4^7 x 5^(-3) for a positive product and (-4)^7 x 5^(-3) for a negative product.
Source: Robert Kaplinsky