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Practice time 1D

1. Form the greatest and the smallest 4-digit numbers using the given digits.

Digits Greatest 4-digit number Smallest 4-digit number
(a) 3, 7, 1, 9
(b) 9, 8, 4, 2

(c) 5, 7, 1, 0
(d) 4, 7, 9, 7

(e) 0, 3, 6, 2
2. Form the numbers with:

(a) 4 in the thousands place (b) 9 in the thousands place
8 in the hundreds place 1 in the hundreds place

5 in the tens place 0 in the tens place
2 in the ones place 6 in the ones place

suCCessor aND PreDeCessor

successor

The number that comes just after a given number is called its successor. To find the

successor of a number, add 1 to the number.
Example 1: Find the successor of: (a) 709 (b) 2154

Solution: (a) The successor of 709 is 709 + 1 = 710
(b) The successor of 2154 is 2154 + 1 = 2155

Predecessor

The number that comes just before a given number is called its predecessor. To find the
predecessor of any number, take away 1 from the number.

Example 2: Find the predecessor of: (a) 921 (b) 8120
Solution: (a) The predecessor of 921 is 921 – 1 = 920

(b) The predecessor of 8120 is 8120 – 1 = 8119

Example 3: Find the successor and predecessor of 2304.
Solution: The successor of 2304 = 2304 + 1 = 2305

The predecessor of 2304 = 2304 – 1 = 2303

2301 2302 2303 2304 2305 2306 2307 2308 2309

Predecessor Successor

20 Mathematics-3