We're dividing 318066 by 21 
We want to figure out the number of times 318066 can be divided by 21.

Going ahead to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 21

Moving on to step 2:
The number 21 fits into 31 1 times, leaving a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 10 after subtracting 21 from 31.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 21

Going ahead to step 3:
108 divided by 21 is 5 with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtracting 105 from 108 leaves us with 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 21

Step 4:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 151.0
If we take 21 away from 30, we end up with 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 21

On to step 5:
If we divide 96 by 21, we get 4 and a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 1514.0
If we subtract 84 from 96, we get 12.
Bring next digit (6) of the dividend behind the 12 and repeat the process: 126 / 21

Step 6:
21 can be fit into 126 6 times, resulting in a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 15146.0
Subtract 126 from 126 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
21 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 15146.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
When dividing 0 by 21, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 15146.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 15146.0 with a remaining 0.0.