Open Middle®
Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create two equations. You may reuse all the integers for each equation.
Hint
How can you verify the value of each side?
Answer
There are many possible answers including –9 + 8 = -4 – (-3) and –-4 + 6 = 8 – (-2). Note that I underlined the integers I used as the negative signs made it a bit confusing.
Source: Robert Kaplinsky
