n = 0.

n = 1.

n = 0.

4, 5.

1

On the number line, whole number 503 is on the left of 530 because 530 is greater than 503 i.e. 530 > 503.

The smallest whole number is zero (0).

The three whole numbers occurring just before 10001 are as follows:
      1000 1- 1 = 10000;
      10000 - 1 = 9999
and  9999 - 1 = 9998
i.e. 10000, 9999 and 9998.

To find 9 - 6
Let us start from 9 and make 6 equal jumps to the left of9. Each jump is equal to 1 unit. Now, we reach at 3.

\(\therefore\)  9 - 6 = 3.

To find 6 - 2
Let us start from 6 and make 2 equal jumps to the left of 6. Each jump is equal to 1 unit. Now, we reach at 4.

\(\therefore\)  6 - 2 = 4.

To find 1+ 6
Let us start from 1. Since, we have to add 6 to this number, we make 6 jumps to the right of 1. Each jump being equal to 1 unit. After six jumps, we reach at 7.

\(\therefore\)  1 + 6 = 7.

To find 3 + 5
Let us start from 3. Since, we have to add 5 to this number, we make 5 jumps to the right of 3. Each jump being equal to 1 unit. After five jumps, we reach at 8.

\(\therefore\)  3 + 5 = 8.

Yes, all the natural numbers are also whole numbers.

No, there is no natural number which has no successor because each natural number has a successor.
e.g. Successor of 4 = 4 + 1 = 5
Successor of 5 = 5 + 1 = 6 and so on.
Also, there is no last. natural number because natural number starts from 1 and goes up to infinite.

Yes, the smallest natural number 1 has no predecessor because predecessor of 1 is (1 - 1 = 0) zero and zero is not a natural number.