Page 23 - Revised Maths Wisdom Class - 3

4-Digit Numbers 21

Predecessor of a Number

The number that comes just before a particular number is called its predecessor. Thus, a
predecessor of a number is always 1 less than the number.

We subtract 1 from the number to get its predecessor.

For example, predecessor of 1234 is 1233.

The predecessor of 2377 is 2376. R
Remember!emember!emember!
The predecessor of 1989 is 1988 and so on.
 Zero has no predecessor.
 Every number has only one successor
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Let's Try and one predecessor except zero.

Example: Write:
(a) the predecessor of 6545 (b) the successor of 8088

(c) the predecessor of 7360

Solution: (a) the predecessor of 6545 is 6544 (b) the successor of 8088 is 8089
(c) the predecessor of 7360 is 7359

Skip Counting
When we count or write numbers aft er skipping a fi xed gap between two successive

numbers, it is called skip counting. For example, counting by 2’s means there is a gap of
two numbers between two successive numbers. Similarly, counting by 10’s means there
is a gap of ten numbers between two successive numbers.

Skip Counting in 2's

1123 1125 1127 1129 1131 1133 1135 1137 1139 1141

Skip Counting in 10's

2445 2455 2465 2475 2485 2495 2505 2515 2525 2535

Let's Try

Example: Counting by 20's, write 5 numbers from 3918 onwards.

Solution: Starting from 3918, the required numbers are 3938, 3958, 3978, 3998, 4018.