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**Hint:**Use definition of multiplicative identity. Multiplicative identity property says that whenever a number is multiplied by the number 1, it will give that number as a product. “1” is the multiplicative identity of a number.

**Complete step-by-step answer:**Given all integers

We have to find the multiplicative identity of integers. As we know multiplication identity elements means any element when multiplied with any number, if you get the same number then that element is called the multiplicative identity element.

Any number when multiplied by 1, results in the number itself.

Hence, 1 is the identity element with respect to multiplication

Additional information:

Identity Element: Any mathematical object that, when applied by an operation, such as addition or multiplication, to another mathematical object, such as a number, leaves the other object unchanged is called an identity element. The two most familiar examples are 0, which when added to a number gives the number, and 1, which is an identity element for multiplication.

More formally, an identity element is defined with respect to a given operation and a given set of elements. For example, 0 is the identity element for addition of integers; 1 is the identity element for multiplication of real numbers. From these examples, it is clear that the operation must involve two elements, as addition does, not a single element, as such operations as taking a power.

Sometimes a set does not have an identity element for some operation. For example, the set of even numbers has no identity element for multiplication, although there is an identity element for addition. Most mathematical systems require an identity element. For example, a group of transformations could not exist without an identity element that is the transformation that leaves an element of the group unchanged.

**Note:**All operations do not always have an identity element. Sometimes a set does not have an identity element for some operation. For example, the set of even numbers has no identity element for multiplication, although there is an identity element for addition.

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