Properties of Whole Numbers

  • Properties of Whole Numbers :Additive Properties (Properties due to Addition):

a) Closure Property of Addition: The Set of Whole Numbers is closed with respect to the operation of Addition. In general, it means that the sum of Whole Numbers is always a Whole Number.

This is known as Closure Property of Addition in the Set of Whole Numbers.

For example: 3 and 5 are two Whole Numbers, then 3 + 5 = 8 is also a Whole Number.

  • b) Commutative Law of Addition: If a and b are two Whole Numbers, then

a + b = b + a.

This is known as Commutative Law of Addition in the Set of Whole Numbers.

For example: 3 and 5 are two Whole Numbers, then

3 + 5 = 8

&

5 + 3 = 8

Hence, it is established that, 3 + 5 = 5 + 3

  • c) Associative Law of Addition: If a, b and c are three Whole Numbers, then

a + (b + c) = (a + b) + c

This is known as Associative Law of Addition in the Set of Whole Numbers.

For example: 3, 5 and 7 are three Whole Numbers then

3 + (5 + 7) = 3 + 12

      = 15

&

(3 + 5) + 7 = 8 + 7

     = 15

Hence, it is established that, 3 + (5 + 7) = (3 + 5) + 7

  • d) Existence of Additive Identity: For every Whole Number a, there exist a unique Whole Number 0 (Zero) such that

0 + a = a + 0 = a

                                0 (Zero) iscalled the Additive Identity in the Set of

Whole Numbers    For example: Let us consider a Whole Number 5. Then we have,

0 + 5 = 5 + 0 = 5

  1. Multiplicative Properties (Properties due to Multiplications):

  • a) Closure Property of Multiplication: The Set of Whole Numbers is closed with respect to the operation of Multiplication. In general, it means that the Product of Whole Numbers is always a Whole Number.

                  This is known as Closure Property of Multiplication in the Set of Whole                   Numbers.

                  For example: 3 and 5 are two Whole Numbers, and then 3 × 5 = 15 is also a                    Whole Number.

Also Read Properties of Natural Numbers

  • b) Commutative Law of Multiplication: If a and b are two Whole Numbers, then

a × b = b × a.

This is known as Commutative Law of Multiplication in the Set of Whole Numbers.

For example: 3 and 5 are two Whole Numbers, then

3 × 5 = 15

&

5 × 3 = 15

Hence, it is established that, 3 × 5 = 5 × 3

  • c) Associative Law of Multiplication: If a, b and c are three Whole Numbers, then

a × (b × c) = (a × b) × c

This is known as Associative Law of Multiplication in the Set of Whole Numbers.

For example: 3, 5 and 7 are three Whole Numbers then

3 × (5 × 7) = 3 × 35

    = 105

&

(3 × 5) × 7 = 15 × 7

    = 105

Hence, it is established that, 3 × (5 × 7) = (3 × 5) × 7

  • d) Existence of Multiplicative Identity: For every Whole Number a, there exist a unique Whole Number 1 (one) such that

a × 1 = 1 × a = a

1 (one) is called the Multiplicative Identity in the Set of Whole Numbers

For example:  5 is a Whole Number, then

5 × 1 = 5

&

1 × 5 = 5

Hence, it is established that, 5 × 1 = 1 × 5 = 5

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Fast Facts:

  1. The Set of Whole Numbers is not closed with respect to the operation of Subtraction. The Difference of two Whole numbers is not always a Whole Number.

Illustrate yourself with suitable example.

  • The Set of Whole Numbers is not closed with respect to the operation of Division. The Quotient of two Whole numbers is not always a Whole Number.

Illustrate yourself with suitable example.

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