We look at the division of 485709 by 18 
We want to figure out the number of times 485709 can be divided by 18.

Let's proceed to step 1:
18 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 18

Let's proceed to step 2:
The number 18 fits into 48 2 times, leaving a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 36 from 48 and we're left with 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 18

On to step 3:
18 can be fit into 125 6 times, resulting in a remainder of 17.
Put 6 as the next digit of the answer. 
Result so far: 26.0
If we take 108 away from 125, we end up with 17.
Grab the next digit (7) from the dividend, add it to 17, then carry on: 177 / 18

Moving on to step 4:
18 can be fit into 177 9 times, resulting in a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 269.0
If we subtract 162 from 177, we get 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 18

Step 5:
18 can be fit into 150 8 times, resulting in a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 2698.0
If we subtract 144 from 150, we get 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 18

Advancing to step 6:
18 goes into 69 3 times with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 26983.0
Subtracting 54 from 69 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
If we divide 150 by 18, we get 8 and a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 26983.8
If we subtract 144 from 150, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
18 can be fit into 60 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 26983.83
Subtracting 54 from 60 leaves us 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.

Moving on to step 9:
18 can be fit into 60 3 times, resulting in a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 26983.833
Deduct 54 from 60 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.

The final result is 26983.833 with a remainder of 0.0006.