43921266 ÷ 858 
Our goal is to divide 43921266 by 858.

Let's proceed to step 1:
858 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 858

Advancing to step 2:
43 divided by 858 is 0 with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Grab the next digit (9) from the dividend, add it to 43, then carry on: 439 / 858

Advancing to step 3:
439 divided by 858 is 0 with a remainder of 439.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 439 after subtracting 0 from 439.
Grab the next digit (2) from the dividend, add it to 439, then carry on: 4392 / 858

Moving on to step 4:
When dividing 4392 by 858, we get 5 with a remainder of 102.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 4290 from 4392 leaves us with 102.
Take the next digit (1) from the dividend and append it to 102, then repeat: 1021 / 858

Step 5:
1021 divided by 858 is 1 with a remainder of 163.
The next digit of our result is 1. 
Result so far: 51.0
Subtract 858 from 1021 to get 163.
Grab the next digit (2) from the dividend, add it to 163, then carry on: 1632 / 858

Let's proceed to step 6:
The number 858 fits into 1632 1 times, leaving a remainder of 774.
Write down 1 as next digit of the result. 
Result so far: 511.0
If we subtract 858 from 1632, we get 774.
Include the next digit (6) from the dividend after 774, then repeat: 7746 / 858

Advancing to step 7:
When dividing 7746 by 858, we get 9 with a remainder of 24.
Put 9 as the next digit of the answer. 
Result so far: 5119.0
If we take 7722 away from 7746, we end up with 24.
Append the next digit (6) from the dividend to 24 and continue with: 246 / 858

On to step 8:
246 divided by 858 is 0 with a remainder of 246.
Record the quotient 0 as the next digit in the result. 
Result so far: 51190.0
Subtracting 0 from 246 leaves us with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Going ahead to step 9:
858 goes into 2460 2 times with a remainder of 744.
Use 2 as the next digit of our solution. 
Result so far: 51190.2
If we take 1716 away from 2460, we end up with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Let's proceed to step 10:
7440 divided by 858 is 8 with a remainder of 576.
The next digit of our result is 8. 
Result so far: 51190.28
Deduct 6864 from 7440 and we're left with 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Going ahead to step 11:
The number 858 fits into 5760 6 times, leaving a remainder of 612.
Put 6 as the next digit of the answer. 
Result so far: 51190.286
Subtracting 5148 from 5760 leaves us with 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Let's proceed to step 12:
If we divide 6120 by 858, we get 7 and a remainder of 114.
Write down 7 as next digit of the result. 
Result so far: 51190.2867
The remainder is 114 after subtracting 6006 from 6120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Step 13:
The number 858 fits into 1140 1 times, leaving a remainder of 282.
The number 1 becomes the next digit in our result. 
Result so far: 51190.28671
Subtracting 858 from 1140 leaves us with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 14:
The number 858 fits into 2820 3 times, leaving a remainder of 246.
Record the quotient 3 as the next digit in the result. 
Result so far: 51190.286713
If we take 2574 away from 2820, we end up with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Step 15:
The number 858 fits into 2460 2 times, leaving a remainder of 744.
Use 2 as the next digit of our solution. 
Result so far: 51190.2867132
If we take 1716 away from 2460, we end up with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Advancing to step 16:
If we divide 7440 by 858, we get 8 and a remainder of 576.
Write down 8 as next digit of the result. 
Result so far: 51190.28671328
The remainder is 576 after subtracting 6864 from 7440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Our division results in 51190.28671328 with a remaining 5.76e-07.