Class 6 Chapter 2 Whole Numbers Math Formulas

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Successor:-

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

 

For Example:-

13 + 1 = 14

So 14 is the successor of 13.

 

Predecessor:-

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

 

For Example:-

13 – 1 = 12

So 12 is the predecessor of 13.

 

Note:-

1 has no predecessor in natural numbers.

 

Whole Numbers:-

Natural number with zero forms the whole numbers.

 

For example:-

0, 1, 2, 3, 4,

 

Note:-

  • The smallest natural number is 1.
  • The number 0 is the first and the smallest whole nos.
  • All natural numbers are whole-numbers.
  • All whole-numbers are not natural numbers. For example, 0 is a whole-number but it is not a natural number.

 

Additive Identity – (0):-

If a is any whole number, then a + 0 = a = 0 + a

 

For Example:-                           

2+ 0 = 2 = 0 + 2

So, 0 is the additive identity of whole numbers.

 

Multiplicative Identity – (1):-

If a is any whole number, then a×1 = a = 1×a

 

For Example:-     

5×1 = 5 = 1×5

So 1 is the multiplicative identity of whole numbers.

Note; zero multiply by any natural number will be 0.