The successor and predecessor of a whole number are discussed below:

**SUCCESSOR**

The number which comes immediately after a particular number is called its successor.*The successor of a whole number is the number obtained by adding 1 to it.*

Clearly, the successor of 0 is 1; successor of 1 is 2; successor of 2 is 3 and so on.

We observe that every whole number has its successor.

**PREDECESSOR**

The number which comes just before a particular number is called its predecessor.

*The predecessor of a whole number is one less than the given number.*

Clearly, the predecessor of 1 is 0; predecessor of 2 is 1; predecessor of 3 is 2 and so on.

The whole number 0 does not have any predecessor.

We observe that every whole number, other than zero, has its predecessor.

Also, if *a* is the successor of *b*, then *b* is the predecessor of *a*.

**For example:**

Find the successor and predecessor of each of the following whole numbers:

(i) 1000

(ii) 11999

(iii) 400099

(iv) 1000001

(v) 99999

**Solution:**

(i) 1000

The successor of 1000 is (1000 + 1) = 1001.

The predecessor of 1000 is (1000 - 1) = 999.

(ii) 11999

The successor of 11999 is (11999 + 1) = 12000.

The predecessor of 11999 is (11999 - 1) = 11998.

(iii) 400099

The successor of 400099 is (400099 + 1) = 400100.

The predecessor of 400099 is (400099 - 1) = 400098.

(iv) 1000001

The successor of 1000001 is (1000001 + 1) = 1000002.

The predecessor of 1000001 is (1000001 - 1) = 1000000.

(v) 99999

The successor of 99999 is (99999 + 1) = 100000.

The predecessor of 99999 is (99999 - 1) = 99998.

**What is Successor and Predecessor of a number?**

The Successor and Predecessor of a number are explained using examples.

** PREDECESSOR NUMBER SUCCESSOR**

(7148 - 1) **7147** **7148 ** (7148 + 1) **7149**

(8950 - 1) **8949** **8950** (8950 + 1) **8951**

(7620 - 1) **7619** **7620** (7620 + 1) **7621**

(12499 - 1) **12498** **12499** (12499 + 1) **12500**

To find the predecessor of a number, subtract 1 from the given number.

To find the successor of a number add 1 to the given number.

**Related Concept **

● Numbers Showing on Spike Abacus.

● 1 Digit Number on Spike Abacus.

● 2 Digits Number on Spike Abacus.

● 3 Digits Number on Spike Abacus.

● 4 Digits Number on Spike Abacus.

● 5 Digits Number on Spike Abacus.

● Problems Related to Place Value.

● Example on Comparison of Numbers.

● Successor and Predecessor of a Whole Number.

● Formation of Numbers with the Given Digits.

● Formation of Greatest and Smallest Numbers.

● Examples on the Formation of Greatest and the Smallest Number.

**4th Grade Math Activities**

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