We're dividing 39876944 by 858 
We want to divide 39876944 by 858.

Step 1:
858 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 858

On to step 2:
When dividing 39 by 858, we get 0 with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Include the next digit (8) from the dividend after 39, then repeat: 398 / 858

Moving on to step 3:
When dividing 398 by 858, we get 0 with a remainder of 398.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 398 leaves us with 398.
Take the next digit (7) from the dividend and append it to 398, then repeat: 3987 / 858

On to step 4:
858 goes into 3987 4 times with a remainder of 555.
The next digit of our result is 4. 
Result so far: 4.0
If we take 3432 away from 3987, we end up with 555.
Append the next digit (6) from the dividend to 555 and continue with: 5556 / 858

Advancing to step 5:
858 goes into 5556 6 times with a remainder of 408.
Write down 6 as next digit of the result. 
Result so far: 46.0
The remainder is 408 after subtracting 5148 from 5556.
Include the next digit (9) from the dividend after 408, then repeat: 4089 / 858

Advancing to step 6:
If we divide 4089 by 858, we get 4 and a remainder of 657.
The next digit of our result is 4. 
Result so far: 464.0
Deduct 3432 from 4089 and we're left with 657.
Append the next digit (4) from the dividend to 657 and continue with: 6574 / 858

Let's proceed to step 7:
6574 divided by 858 is 7 with a remainder of 568.
Use 7 as the next digit of our solution. 
Result so far: 4647.0
Subtracting 6006 from 6574 leaves us with 568.
Take the next digit (4) from the dividend and append it to 568, then repeat: 5684 / 858

Going ahead to step 8:
When dividing 5684 by 858, we get 6 with a remainder of 536.
The number 6 becomes the next digit in our result. 
Result so far: 46476.0
Deduct 5148 from 5684 and we're left with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Going ahead to step 9:
5360 divided by 858 is 6 with a remainder of 212.
Write down 6 as next digit of the result. 
Result so far: 46476.6
If we subtract 5148 from 5360, we get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Moving on to step 10:
When dividing 2120 by 858, we get 2 with a remainder of 404.
Use 2 as the next digit of our solution. 
Result so far: 46476.62
Deduct 1716 from 2120 and we're left with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Advancing to step 11:
858 can be fit into 4040 4 times, resulting in a remainder of 608.
Use 4 as the next digit of our solution. 
Result so far: 46476.624
If we take 3432 away from 4040, we end up with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Going ahead to step 12:
858 goes into 6080 7 times with a remainder of 74.
The next digit of our result is 7. 
Result so far: 46476.6247
If we take 6006 away from 6080, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 13:
The number 858 fits into 740 0 times, leaving a remainder of 740.
Use 0 as the next digit of our solution. 
Result so far: 46476.6247
Deduct 0 from 740 and we're left with 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7400, and continue the process.

Going ahead to step 14:
858 can be fit into 7400 8 times, resulting in a remainder of 536.
The next digit of our result is 8. 
Result so far: 46476.624708
Subtracting 6864 from 7400 leaves us with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Moving on to step 15:
When dividing 5360 by 858, we get 6 with a remainder of 212.
Write down 6 as next digit of the result. 
Result so far: 46476.6247086
If we take 5148 away from 5360, we end up with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Let's proceed to step 16:
858 goes into 2120 2 times with a remainder of 404.
Record the quotient 2 as the next digit in the result. 
Result so far: 46476.62470862
If we take 1716 away from 2120, we end up with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

After the division, we end up with 46476.62470862 and a remainder of 4.04e-07.