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Natural Numbers & Whole Numbers

  • The collection of all counting numbers is known as natural numbers.

These are 1, 2, 3, 4 … and so on.

  • All natural numbers along with zero are called whole numbers.

These are 0, 1, 2, 3, 4 … and so on.

  • All natural numbers are whole numbers, but all whole numbers are not natural numbers.
  • We can write a natural number using 10 symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Each of such symbols is called a digit or a figure
  • Number line:

To draw a number line, we take a line and mark a point on it, labelling it 0. Then, we mark the points to the right of zero at equal intervals and label them as 1, 2, 3 …, as follows:

 On the number line, we can say that out of any two whole numbers, the number on the right of the other number is greater.


Example: Place predecessor of 6 on the number line.


The predecessor of 6 is 5. On the number line, we can show 5 as follows:




  • According to fundamental theorem of arithmetic, a …

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