We look at the division of 436531 by 81 
We're looking to find how many times 81 goes into 436531.

Going ahead to step 1:
When dividing 4 by 81, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 81

Step 2:
The number 81 fits into 43 0 times, leaving a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Fetch the next digit (6) from the dividend, attach it to 43 and continue: 436 / 81

Moving on to step 3:
When dividing 436 by 81, we get 5 with a remainder of 31.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtract 405 from 436 to get 31.
Grab the next digit (5) from the dividend, add it to 31, then carry on: 315 / 81

Moving on to step 4:
81 can be fit into 315 3 times, resulting in a remainder of 72.
Put 3 as the next digit of the answer. 
Result so far: 53.0
Deduct 243 from 315 and we're left with 72.
Include the next digit (3) from the dividend after 72, then repeat: 723 / 81

Let's proceed to step 5:
81 can be fit into 723 8 times, resulting in a remainder of 75.
The number 8 becomes the next digit in our result. 
Result so far: 538.0
If we take 648 away from 723, we end up with 75.
Grab the next digit (1) from the dividend, add it to 75, then carry on: 751 / 81

Advancing to step 6:
81 can be fit into 751 9 times, resulting in a remainder of 22.
The number 9 becomes the next digit in our result. 
Result so far: 5389.0
The remainder is 22 after subtracting 729 from 751.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 7:
The number 81 fits into 220 2 times, leaving a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 5389.2
Subtract 162 from 220 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
81 can be fit into 580 7 times, resulting in a remainder of 13.
The next digit of our result is 7. 
Result so far: 5389.27
If we take 567 away from 580, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 9:
The number 81 fits into 130 1 times, leaving a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 5389.271
Subtracting 81 from 130 leaves us with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 10:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 5389.2716
Subtract 486 from 490 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
81 can be fit into 40 0 times, resulting in a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 5389.2716
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 12:
When dividing 400 by 81, we get 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 5389.271604
Deduct 324 from 400 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 13:
81 goes into 760 9 times with a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 5389.2716049
If we subtract 729 from 760, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 14:
The number 81 fits into 310 3 times, leaving a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 5389.27160493
If we take 243 away from 310, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

The final outcome is 5389.27160493, with a leftover of 6.7e-08.