43911869 ÷ 81 
Our goal is to divide 43911869 by 81.

Step 1:
If we divide 4 by 81, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 81

Going ahead to step 2:
When dividing 43 by 81, we get 0 with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Fetch the next digit (9) from the dividend, attach it to 43 and continue: 439 / 81

Step 3:
81 can be fit into 439 5 times, resulting in a remainder of 34.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 405 from 439 to get 34.
Bring next digit (1) of the dividend behind the 34 and repeat the process: 341 / 81

On to step 4:
The number 81 fits into 341 4 times, leaving a remainder of 17.
Write down 4 as next digit of the result. 
Result so far: 54.0
The remainder is 17 after subtracting 324 from 341.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 81

Going ahead to step 5:
When dividing 171 by 81, we get 2 with a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 542.0
The remainder is 9 after subtracting 162 from 171.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 81

Advancing to step 6:
The number 81 fits into 98 1 times, leaving a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 5421.0
The remainder is 17 after subtracting 81 from 98.
Take the next digit (6) from the dividend and append it to 17, then repeat: 176 / 81

Going ahead to step 7:
If we divide 176 by 81, we get 2 and a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 54212.0
Subtract 162 from 176 to get 14.
Take the next digit (9) from the dividend and append it to 14, then repeat: 149 / 81

Going ahead to step 8:
The number 81 fits into 149 1 times, leaving a remainder of 68.
Write down 1 as next digit of the result. 
Result so far: 542121.0
Deduct 81 from 149 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 9:
The number 81 fits into 680 8 times, leaving a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 542121.8
If we take 648 away from 680, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
81 can be fit into 320 3 times, resulting in a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 542121.83
Subtract 243 from 320 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Advancing to step 11:
The number 81 fits into 770 9 times, leaving a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 542121.839
Subtract 729 from 770 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 12:
If we divide 410 by 81, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 542121.8395
If we take 405 away from 410, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 13:
When dividing 50 by 81, we get 0 with a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 542121.8395
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 14:
500 divided by 81 is 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 542121.839506
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 15:
The number 81 fits into 140 1 times, leaving a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 542121.8395061
Deduct 81 from 140 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 16:
81 goes into 590 7 times with a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 542121.83950617
If we subtract 567 from 590, 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.

The quotient of the division is 542121.83950617, and the remainder is 2.3e-08.