Short Notes: Whole Numbers

Whole Numbers Class 6 Notes Maths Chapter 2

Natural Numbers

All the positive counting numbers starting from one are called Natural Numbers.

Whole Numbers

Whole numbers are the collection of natural numbers including zero. So, the zero is the predecessor of 1 in the whole numbers.

Predecessor and Successor

If we add 1 to any natural number, we get the next number, which is called the Successor of that number.

For Example:

12 + 1 = 13
So 13 is the successor of 12.

If we subtract 1 from any natural number, we get the predecessor of that number.

For Example:

12 – 1 = 11
So 11 is the predecessor of 12.

Question for Short Notes: Whole Numbers
Try yourself:What is the relationship between natural numbers and whole numbers?

Number Line

To draw a number line, follow these steps-

• Draw a line and mark a point 0 on it.
• Now mark the second point to the right of zero and label it as 1.
• The distance between the 0 and 1 is called the unit distance.
• Now you can mark other points as 2, 3, 4 and so on with the unit distance.

This is the number line for the whole numbers.

• The distance between two points
The distance between 3 and 5 is 2 units. Likewise, the distance between 1 and 6 is 5 units.
• The greater number on the number line
The number on the right is always greater than the number on the left.
As number 5 is on the right of the number 2, Hence 5>2.
• A smaller number on the number line
The number on the left of any number is always smaller than that number.
As number 3 is on the left of 7, so 3 < 7.

If we have to add 2 and 5, then start with 2 and make 5 jumps to the right. As our 5th jump is at 7 so the answer is 7.
The sum of 2 and 5 is 2 + 5 = 7

Subtraction on the Number Line

If we have to subtract 6 from 10, then we have to start from 10 and make 6 jumps to the left. As our 6th jump is at 4, so the answer is 4.

The subtraction of 6 from 10 is 10 – 6 = 4.

Multiplication on the Number Line

If we have to multiply 4 and 3, then Start from 0, make 4 jumps using 3 units at a time to the right, as you reach to 12. So, we say, 3 × 4 = 12.

The document Whole Numbers Class 6 Notes Maths Chapter 2 is a part of the Class 6 Course Mathematics (Maths) Class 6.
All you need of Class 6 at this link: Class 6

Mathematics (Maths) Class 6

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FAQs on Whole Numbers Class 6 Notes Maths Chapter 2

 1. What are natural numbers?
Natural numbers are the counting numbers starting from 1 and going on infinitely. They do not include zero or negative numbers. Examples of natural numbers are 1, 2, 3, 4, 5, and so on.
 2. What are whole numbers?
Whole numbers are the set of natural numbers along with zero. They include all the counting numbers starting from zero and going on infinitely. Examples of whole numbers are 0, 1, 2, 3, 4, 5, and so on.
 3. What is the predecessor and successor of a number?
The predecessor of a number is the number that comes before it. For example, the predecessor of 7 is 6. The successor of a number is the number that comes after it. For example, the successor of 7 is 8.
 4. How can a number line be used for addition?
A number line can be used for addition by representing the two numbers to be added as points on the number line. Starting from the first number, we move to the right by the value of the second number to find the sum. For example, to add 3 and 5, we start from 3 on the number line and move 5 units to the right to reach the sum, which is 8.
 5. How can a number line be used for subtraction?
A number line can be used for subtraction by representing the two numbers involved in the subtraction as points on the number line. Starting from the first number, we move to the left by the value of the second number to find the difference. For example, to subtract 5 from 8, we start from 8 on the number line and move 5 units to the left to reach the difference, which is 3.

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