Properties of Multiplication of Integers: Closure Property and Commutative Property

Get top class preparation for KVPY/Stream-SB-SX Mathematics right from your home: fully solved questions with step-by-step explanation- practice your way to success.

The multiplication of integers refers to the product of two or more integers. To recall, the set of numbers which consist of natural numbers, the additive inverse of natural numbers and zero are known as integers. Thus, integers can either be positive or negative and they have a magnitude and a sign associated with them. They are represented using Z or I. In this article, let us discuss the multiplication operations on integers and the properties of multiplication in detail.

What Are Integers?

Integers are the whole numbers, but it does not include fractions. The integer can be either positive integer or negative integer.

For example: -53, 0, 1237, 31, -102, -401, -355, 86600 etc.

Integers can be located on the real number line as shown below.

Properties of Multiplication of Integers

Properties of Multiplication of Integers

Loading Image

The four basic mathematical operations i.e. Addition, subtraction, multiplication, division and the properties related to these operations can be applied to integers as well.

Multiplication of Integers

Multiplication is basically repeated addition. Therefore, multiplication of integers is the repeated addition as:

Multiplication of Integers

Multiplication of Integers

Loading Image

Where a and n are both integers.

Properties of Multiplication of Integers

The properties of multiplication of integers are:

  • Closure property

  • Commutative property

  • Multiplication by zero

  • Multiplicative identity

  • Associative property

  • Distributive property

Closure Property

According to this property, if two integers a and b are multiplied then their resultant is also an integer. Therefore, integers are closed under multiplication.

is an integer, for every integer a and b

Commutative Property

The commutative property of multiplication of integers states that altering the order of operands or the integers does not affect the result of the multiplication.

for every integer a and b

Multiplication by Zero

On multiplying any integer by zero the result is always zero. In general, if a and b are two integers then,

Multiplicative Identity of Integers

On multiplying any integer by 1 the result obtained is the integer itself. In general, if a and b are two integers then,

Therefore 1 is the Multiplicative Identity of Integers.

Associative Property

The result of the product of three or more integers is irrespective of the grouping of these integers. In general, if a, b and c are three integers then,

Distributive Property

According to the distributive property of multiplication of integers, if a, b and c are three integers then,

Example 1: Verify

Solution:

L.H.S

R.H.S

Example 2:

Solution:

Here given,

Example: 3

Solution: