Let's divide 15852687 by 858
Our goal is to divide 15852687 by 858.

Moving on to step 1:
The number 858 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 858

On to step 2:
If we divide 15 by 858, we get 0 and a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Include the next digit (8) from the dividend after 15, then repeat: 158 / 858

Going ahead to step 3:
858 can be fit into 158 0 times, resulting in a remainder of 158.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 158, we end up with 158.
Append the next digit (5) from the dividend to 158 and continue with: 1585 / 858

Advancing to step 4:
1585 divided by 858 is 1 with a remainder of 727.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 858 from 1585 to get 727.
Take the next digit (2) from the dividend and append it to 727, then repeat: 7272 / 858

Step 5:
7272 divided by 858 is 8 with a remainder of 408.
Use 8 as the next digit of our solution. 
Result so far: 18.0
If we subtract 6864 from 7272, we get 408.
Include the next digit (6) from the dividend after 408, then repeat: 4086 / 858

Step 6:
When dividing 4086 by 858, we get 4 with a remainder of 654.
Use 4 as the next digit of our solution. 
Result so far: 184.0
If we subtract 3432 from 4086, we get 654.
Fetch the next digit (8) from the dividend, attach it to 654 and continue: 6548 / 858

Step 7:
The number 858 fits into 6548 7 times, leaving a remainder of 542.
The number 7 becomes the next digit in our result. 
Result so far: 1847.0
Subtract 6006 from 6548 to get 542.
Include the next digit (7) from the dividend after 542, then repeat: 5427 / 858

On to step 8:
858 can be fit into 5427 6 times, resulting in a remainder of 279.
Write down 6 as next digit of the result. 
Result so far: 18476.0
Subtract 5148 from 5427 to get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Moving on to step 9:
858 goes into 2790 3 times with a remainder of 216.
Put 3 as the next digit of the answer. 
Result so far: 18476.3
Subtract 2574 from 2790 to get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 10:
If we divide 2160 by 858, we get 2 and a remainder of 444.
Put 2 as the next digit of the answer. 
Result so far: 18476.32
Subtracting 1716 from 2160 leaves us with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

On to step 11:
When dividing 4440 by 858, we get 5 with a remainder of 150.
Record the quotient 5 as the next digit in the result. 
Result so far: 18476.325
Subtracting 4290 from 4440 leaves us with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 12:
The number 858 fits into 1500 1 times, leaving a remainder of 642.
The next digit of our result is 1. 
Result so far: 18476.3251
If we subtract 858 from 1500, we get 642.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6420, and continue the process.

Let's proceed to step 13:
If we divide 6420 by 858, we get 7 and a remainder of 414.
Record the quotient 7 as the next digit in the result. 
Result so far: 18476.32517
Subtracting 6006 from 6420 leaves us with 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

Moving on to step 14:
When dividing 4140 by 858, we get 4 with a remainder of 708.
The next digit of our result is 4. 
Result so far: 18476.325174
If we subtract 3432 from 4140, we get 708.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7080, and continue the process.

On to step 15:
If we divide 7080 by 858, we get 8 and a remainder of 216.
Use 8 as the next digit of our solution. 
Result so far: 18476.3251748
Subtracting 6864 from 7080 leaves us with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

On to step 16:
When dividing 2160 by 858, we get 2 with a remainder of 444.
Record the quotient 2 as the next digit in the result. 
Result so far: 18476.32517482
If we subtract 1716 from 2160, we get 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

The final result is 18476.32517482 with a remainder of 4.44e-07.