843851 ÷ 18 
We want to figure out the number of times 843851 can be divided by 18.

Step 1:
8 divided by 18 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 18

Moving on to step 2:
18 goes into 84 4 times with a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 72 away from 84, we end up with 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 18

Step 3:
The number 18 fits into 123 6 times, leaving a remainder of 15.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Subtract 108 from 123 to get 15.
Grab the next digit (8) from the dividend, add it to 15, then carry on: 158 / 18

Advancing to step 4:
18 can be fit into 158 8 times, resulting in a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 468.0
Subtract 144 from 158 to get 14.
Grab the next digit (5) from the dividend, add it to 14, then carry on: 145 / 18

Going ahead to step 5:
When dividing 145 by 18, we get 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 4688.0
Deduct 144 from 145 and we're left with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 18

Advancing to step 6:
If we divide 11 by 18, we get 0 and a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 46880.0
If we subtract 0 from 11, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
18 goes into 110 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 46880.6
Deduct 108 from 110 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
The number 18 fits into 20 1 times, leaving a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 46880.61
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 9:
18 can be fit into 20 1 times, resulting in a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 46880.611
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 46880.611, and the remainder is 0.0002.