We're dividing 355166 by 20 
We're looking to find how many times 20 goes into 355166.

Going ahead to step 1:
If we divide 3 by 20, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 20

Advancing to step 2:
If we divide 35 by 20, we get 1 and a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 20 from 35 leaves us with 15.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 20

Moving on to step 3:
20 can be fit into 155 7 times, resulting in a remainder of 15.
The next digit of our result is 7. 
Result so far: 17.0
Subtracting 140 from 155 leaves us with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 20

Advancing to step 4:
When dividing 151 by 20, we get 7 with a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 177.0
If we take 140 away from 151, we end up with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 20

Moving on to step 5:
The number 20 fits into 116 5 times, leaving a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 1775.0
The remainder is 16 after subtracting 100 from 116.
Take the next digit (6) from the dividend and append it to 16, then repeat: 166 / 20

Let's proceed to step 6:
166 divided by 20 is 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 17758.0
Deduct 160 from 166 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
60 divided by 20 is 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 17758.3
If we subtract 60 from 60, we 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.

On to step 8:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17758.3
Subtract 0 from 0 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.

On to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17758.3
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 17758.3 with a remaining 0.0.