Open Middle®
Directions: Using the integers -9 to 9, at most one time each, place an integer in each box to make the number line true. Note: The number line is not necessarily drawn to scale.
Hint
What boxes would be easier to begin with? Harder?
Answer
There are many answers, including [-8, -6, -5, -1/4, “0”, 2, 9/3, 7] and [-9, -5, -1, -4/6, “0”, 2, 7/3, 8]
Source: Amy Bloom
Hi! There are 10 boxes in the problem but they can only use 9 different digits. Or are the negative and positive numbers considered different digits? The answer options only use 9 digits.
Hi Heather! Great question. Negative and positive numbers are considered different integers. With the integers -9 through 9, there are 19 different possible numbers to use for this problem.
-8