Android app allows you select operation type with powers, then press the button with the right answer to the randomly generated problem.
POWERS AND EXPONENTS is a free educational mobile app By Antonio Luis Climent Albaladejo.It helps students in grades HS practice the following standards HSN.RN.A.1.
1. HSN.RN.A.1 : Explain how the definition of the meaning of rational exponents follows from extending the properties of integer exponents to those values, allowing for a notation for radicals in terms of rational exponents. For example, we define 51/3 to be the cube root of 5 because we want (51/3)3 = 5(1/3)3 to hold, so (51/3)3 must equal 5.