Page 17 - ICSE Math 4

Predecessor and Successor

A number that comes just before a given number or is one less than it is called the
predecessor of that number.

A number that comes just a er a given number or is one more than it is called the successor
of that number.

Let’s consider a 5-digit number 16,832, and fi nd its predecessor and successor.
The predecessor of 16,832 is 16,832 – 1 = 16,831 and its successor is 16,832 + 1 = 16,833.
Example 9: Find the predecessor and successor of 2,45,304.

Solu on: Predecessor of 2,45,304 = 2,45,304 – 1 = 2,45,303

Successor of 2,45,304 = 2,45,304 + 1 = 2,45,305
Ordering of Numbers

We already know that numbers can be arranged either in ascending order (smaller to
bigger) or descending order (bigger to smaller).
Example 10: Write the given numbers in ascending and descending order.

74,328; 28,537; 76,240; 3,43,200; 29,643

Solu on: Ascending order: 28,537 < 29,643 < 74,328 < 76,240 < 3,43,200
Descending order: 3,43,200 > 76,240 > 74,328 > 29,643 > 28,537

Exercise 1.2

1. Put the correct sign >, < or =.

(a) 69,410 69,342 (b) 9,00,375 9,00,375

(c) 3,92,085 3,93,805 (d) 9,07,632 8,15,426

2. Arrange the following numbers in ascending order.

(a) 94,281; 73,971; 84,183; 2,697; 3,824
(b) 9,984; 10,426; 7,480; 11,397; 10,269

(c) 84,631; 83,462; 85,316; 83,625; 1,94,940
(d) 3,20,284; 3,19,706; 3,42,053; 3,39,513; 3,07,654

3. Arrange the following numbers in descending order.

(a) 7,063; 7,128; 8,375; 8,503; 7,219
(b) 18,234; 9,945; 17,946; 18,432; 18,963

(c) 2,23,705; 2,32,817; 2,40,098; 2,54,419; 2,17,390
(d) 9,08,743; 9,14,827; 8,23,999; 9,99,872; 8,13,948

7