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Predecessor

The number that comes just before the given number is called its predecessor.

To find the predecessor of any number, subtract 1 from the number.

example 2: Find the predecessor of:

(a) 30 (b) 921 (c) 8,120

Solution: (a) The predecessor of 30 is 30 – 1 = 29
(b) The predecessor of 921 is 921 – 1 = 920

(c) The predecessor of 8,120 is 8,120 – 1 = 8,119

Think and Answer
Write 'T' for true and 'F' for false in the given boxes.
1. The greatest 2-digit number is the predecessor of the smallest 3-digit number.
2. The smallest 2-digit number is the successor of the greatest 1-digit number.
3. The smallest 4-digit number is the successor of the smallest 3-digit number.
4. The greatest 3-digit number is the predecessor of the greatest 4-digit number.

eVeN aND oDD Numbers

even Numbers

All the numbers that can be made into pairs are called even numbers.

Here are 6 oranges, which have been kept in pairs.

So, 6 is an even number.
All the numbers that have 2, 4, 6, 8 and 0 in the ones place are even numbers.

For example: 52, 124, 520, 3008, etc.
odd Numbers

The numbers that cannot be made into pairs are called odd numbers..
Here are 7 oranges; out of them 6 have been kept in pairs and 1 orange is left unpaired.

It means 7 cannot be made into pairs.
So, 7 is an odd number.

All the numbers that have 1, 3, 5, 7 and 9 in the ones place are odd numbers.

For example: 29, 343, 695, 82, 71, etc.

Think and Answer
Is your class roll number even or odd?

22 Mathematics-3