Try the calculator here. If you don't know how to use the power key "x^y", then multiply 9 by itself 4 times: 9 x 9 x 9 x 9=?. But you should learn how to use the power key. First, you enter 9, then press the "x^y" key, then enter 4, followed by = sign, and you should get your answer.Compare it to multiplying 4 9s, and see if it is the same answer.
