We look at the division of 859509 by 51 
We want to divide 859509 by 51.

On to step 1:
When dividing 8 by 51, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 51

Advancing to step 2:
When dividing 85 by 51, we get 1 with a remainder of 34.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 51 from 85 and we're left with 34.
Include the next digit (9) from the dividend after 34, then repeat: 349 / 51

Moving on to step 3:
349 divided by 51 is 6 with a remainder of 43.
Write down 6 as next digit of the result. 
Result so far: 16.0
The remainder is 43 after subtracting 306 from 349.
Include the next digit (5) from the dividend after 43, then repeat: 435 / 51

Moving on to step 4:
The number 51 fits into 435 8 times, leaving a remainder of 27.
Write down 8 as next digit of the result. 
Result so far: 168.0
If we subtract 408 from 435, we get 27.
Include the next digit (0) from the dividend after 27, then repeat: 270 / 51

Going ahead to step 5:
If we divide 270 by 51, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 1685.0
Deduct 255 from 270 and we're left with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 51

Advancing to step 6:
51 goes into 159 3 times with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 16853.0
Deduct 153 from 159 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:
The number 51 fits into 60 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 16853.1
The remainder is 9 after subtracting 51 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 8:
If we divide 90 by 51, we get 1 and a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 16853.11
If we take 51 away from 90, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final result is 16853.11 with a remainder of 0.039.