Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the equation true.
Hint
What do fraction exponents represent?
Answer
There are many possible answers, one is (see image):


Source: Shaun Errichiello
Open Middle®
I think this is marked with the wrong grade level. 8th grade math standards call for integer exponents (8.EE.A)
Rational exponents are N-RN.A, in either Algebra 1 or Integrated Math II.
Thank you for bringing that to our attention, Kristie. The standard has been corrected.