identity properties of addition and multiplication


Definition of Identity Properties of Addition and Multiplication


  • Identity property of addition states that the sum of zero and any number or variable is the number or variable itself.
  • For example, 4 + 0 = 4, - 11 + 0 = - 11, y + 0 = y are few examples illustrating the identity property of addition.
  • Identity property of multiplication states that the product of 1 and any number or variable is the number or variable itself.
  • For example, 4 × 1 = 4, - 11 × 1 = - 11, y × 1 = y are few examples illustrating the identity property of multiplication.

Solved Example on Identity Properties of Addition and Multiplication

Which of the following equations illustrate identity property of addition?
Choices:
A. xy = yx
B. x + 0 = x
C. (x + y) + z = x + (y + z)
D. x + 1 = 1 + x
Correct Answer: B
Solution:
Step 1:  According to identity property of addition, the sum of a number and 0 is the number itself.
Step 2:  Among the choices, the equation x + 0 = x illustrates identity property of addition.

Related Terms for Identity Properties of Addition and Multiplication

  • Addition
  • Multiplication
  • Sum
  • Product