Multiplication
The operation that will always have the result in value of 1 for any nonzero number is Inverse Operation of Multipication.
multiplying by zero
Adding zero
The answer depends on what operation might cause the change.
Multiplication by zero is one such operation.
A nonzero whole number is a quantity which does not equal zero and number without fractions.
Actually the product of a nonzero rational number and another rational number will always be rational.The product of a nonzero rational number and an IRrational number will always be irrational. (You have to include the "nonzero" caveat because zero times an irrational number is zero, which is rational)
The product of two nonzero whole numbers will be a nonzero whole number.
A quantity which does not equal zero is said to be nonzero.
A nonzero multiple of a number is a multiple which is not equal to 0.
A mathematical element that when added to another numeral makes the same numeral
Every nonzero number has multiples. Every set of nonzero numbers has an LCM.