We look at the division of 866123 by 53 
We want to divide 866123 by 53.

Advancing to step 1:
When dividing 8 by 53, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 53

Let's proceed to step 2:
53 goes into 86 1 times with a remainder of 33.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 53 away from 86, we end up with 33.
Include the next digit (6) from the dividend after 33, then repeat: 336 / 53

Step 3:
336 divided by 53 is 6 with a remainder of 18.
The next digit of our result is 6. 
Result so far: 16.0
Subtracting 318 from 336 leaves us with 18.
Take the next digit (1) from the dividend and append it to 18, then repeat: 181 / 53

Step 4:
53 can be fit into 181 3 times, resulting in a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 163.0
If we take 159 away from 181, we end up with 22.
Append the next digit (2) from the dividend to 22 and continue with: 222 / 53

Going ahead to step 5:
222 divided by 53 is 4 with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 1634.0
If we take 212 away from 222, we end up with 10.
Bring next digit (3) of the dividend behind the 10 and repeat the process: 103 / 53

Moving on to step 6:
53 goes into 103 1 times with a remainder of 50.
The next digit of our result is 1. 
Result so far: 16341.0
Subtract 53 from 103 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 7:
If we divide 500 by 53, we get 9 and a remainder of 23.
The number 9 becomes the next digit in our result. 
Result so far: 16341.9
If we subtract 477 from 500, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 8:
53 goes into 230 4 times with a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 16341.94
Deduct 212 from 230 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 9:
53 can be fit into 180 3 times, resulting in a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 16341.943
If we take 159 away from 180, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 10:
The number 53 fits into 210 3 times, leaving a remainder of 51.
The number 3 becomes the next digit in our result. 
Result so far: 16341.9433
Subtracting 159 from 210 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Our division results in 16341.9433 with a remaining 0.00051.