Press space to calculate.The base slider sets the base number.The exp slider sets your exponent.You can see all the digits in the answer list when you download. Negative exponents means 1 over the number to the same exponent but positive.For example 5 to the -2 would be 1/5^2 = 1/25 PS The ^ sign means "To the".3^3 is 3 to the 3rd which is 27.