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2. Form a number with:

a. 6 at thousands place b. 9 at thousands place c. 3 at thousands place
2 at hundreds place 1 at hundreds place 7 at hundreds place

7 at tens place 0 at tens place 2 at tens place

1 at ones place 5 at ones place 4 at ones place

3. Can you correct your friends?

Riya and Prakash have made the greatest and the smallest 9750 9705
4-digit numbers using the digits: 9, 0, 7 and 5.
0579 5079
a. Circle the number which is not appropriate.
riya Prakash
b. Who has made the correct greatest number? __________

c. Who has made the correct smallest number? __________

SUCCESSor AND PrEDECESSor

Successor

The number that comes just after a given number is called its Successor. We can find
the successor of a number by adding 1 to the number.

Example 1. Find the successor of:

a. 7 b. 88 c. 648
Solution. a. The successor of 7 = 7 + 1 = 8

b. The successor of 88 = 88 + 1 = 89
c. The successor of 648 = 648 + 1 = 649

Predecessor

The number that comes just before a given number is called its Predecessor. We can

find the predecessor of a number by subtracting 1 from the number.

Example 2. Find the predecessor of:

a. 6 b. 99 c. 1246
Solution. a. The predecessor of 6 = 6 – 1 = 5

b. The predecessor of 99 = 99 – 1 = 98
c. The predecessor of 1246 = 1246 – 1 = 1245

26 Mathematics 3