For 6 - 3, start from 6 and make 3 jumps on the left by unit distance each. Then, we reach at 3.

So,     6 - 3 = 3.

For 6 x 3, start from 0 and move 6 units at a time, make 3 such moves. Then, we reach at 18.

So,   6 x 3 = 18.

Yes, we can divide 0 by 219 and answer is 0.
i.e. 0 + 219 = 0.

2307

Whole numbers between 32 and 53 are as follows:
33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,  50, 51 and 52.
Hence, total number of whole numbers between 32 and 53 is 20.
Alternate Method
We can find the total numbers by using (b - a) - 1.
Where, a = First number and b = Last number
Here, a = 32, b = 53
Whole numbers between 32 and 53 = (b - a) - 1
                                                    = (53 - 32) -1 [putting the values of a and b)
                                                    = 21 - 1 = 20.

There are many examples of such type. Five of them are as follows:

The smallest number of 7-digit = 1000000
and the largest number of 4-digit = 9999
\(\therefore\) The difference between them
= 1000000 - 9999 = 990001

(a) Given, number of children, who got polio drops in March 2013 = 212583
Number of children, who got polio drops in next month = 216813
\(\therefore\) Difference of the number of children getting polio drops in two months
= 216813 - 212583 = 4230 children.
(b) Importance of pulse polio drops
The children are vaccinated for their protectior against deadly polio virus. All the babies below 5 yrs of age are given oral polio vaccine simultaneously, it helps to eradicate the virus.

The product of non-zero whole number and its successor is always an even number.

Let the whole number be x.
Now, according to the question,
x + 25 + 25 - x = 50.

Zero (0) has no predecessor.

Here, we will find successor of 300, 300 + 1 = 301
So, 300 is the predecessor of 301.

Here, we will find predecessor of 450 = 450 - 1 = 449
So, 450 is the successor of 449.

According to the associative law under addition,
125 + (68 + 32) = (125 + 68) + 32.

We have,
1785 x 3 + 1785 x 7 = 1785 (3 + 7)
                              = 1785 x 10 = 17850.