87128239 divided by 858 
Our goal is to divide 87128239 by 858.

Step 1:
858 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 858

On to step 2:
The number 858 fits into 87 0 times, leaving a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Fetch the next digit (1) from the dividend, attach it to 87 and continue: 871 / 858

Going ahead to step 3:
When dividing 871 by 858, we get 1 with a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 858 from 871 and we're left with 13.
Fetch the next digit (2) from the dividend, attach it to 13 and continue: 132 / 858

Let's proceed to step 4:
If we divide 132 by 858, we get 0 and a remainder of 132.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we take 0 away from 132, we end up with 132.
Fetch the next digit (8) from the dividend, attach it to 132 and continue: 1328 / 858

On to step 5:
858 can be fit into 1328 1 times, resulting in a remainder of 470.
Write down 1 as next digit of the result. 
Result so far: 101.0
If we subtract 858 from 1328, we get 470.
Fetch the next digit (2) from the dividend, attach it to 470 and continue: 4702 / 858

Let's proceed to step 6:
4702 divided by 858 is 5 with a remainder of 412.
Use 5 as the next digit of our solution. 
Result so far: 1015.0
Subtract 4290 from 4702 to get 412.
Include the next digit (3) from the dividend after 412, then repeat: 4123 / 858

Step 7:
When dividing 4123 by 858, we get 4 with a remainder of 691.
Record the quotient 4 as the next digit in the result. 
Result so far: 10154.0
The remainder is 691 after subtracting 3432 from 4123.
Grab the next digit (9) from the dividend, add it to 691, then carry on: 6919 / 858

Moving on to step 8:
The number 858 fits into 6919 8 times, leaving a remainder of 55.
Use 8 as the next digit of our solution. 
Result so far: 101548.0
Deduct 6864 from 6919 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 9:
When dividing 550 by 858, we get 0 with a remainder of 550.
Use 0 as the next digit of our solution. 
Result so far: 101548.0
If we take 0 away from 550, we end up with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Step 10:
The number 858 fits into 5500 6 times, leaving a remainder of 352.
The number 6 becomes the next digit in our result. 
Result so far: 101548.06
Subtract 5148 from 5500 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

On to step 11:
858 can be fit into 3520 4 times, resulting in a remainder of 88.
Write down 4 as next digit of the result. 
Result so far: 101548.064
Subtract 3432 from 3520 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 12:
858 can be fit into 880 1 times, resulting in a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 101548.0641
Subtracting 858 from 880 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 13:
When dividing 220 by 858, we get 0 with a remainder of 220.
The next digit of our result is 0. 
Result so far: 101548.0641
If we subtract 0 from 220, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Let's proceed to step 14:
When dividing 2200 by 858, we get 2 with a remainder of 484.
The next digit of our result is 2. 
Result so far: 101548.064102
If we subtract 1716 from 2200, we get 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Step 15:
If we divide 4840 by 858, we get 5 and a remainder of 550.
Put 5 as the next digit of the answer. 
Result so far: 101548.0641025
Subtracting 4290 from 4840 leaves us with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Step 16:
5500 divided by 858 is 6 with a remainder of 352.
Write down 6 as next digit of the result. 
Result so far: 101548.06410256
Deduct 5148 from 5500 and we're left with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Our division results in 101548.06410256 with a remaining 3.52e-07.