420535 ÷ 81 
We want to figure out the number of times 420535 can be divided by 81.

Going ahead to step 1:
The number 81 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 81

Advancing to step 2:
81 can be fit into 42 0 times, resulting in a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Fetch the next digit (0) from the dividend, attach it to 42 and continue: 420 / 81

On to step 3:
81 goes into 420 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 5.0
Subtract 405 from 420 to get 15.
Take the next digit (5) from the dividend and append it to 15, then repeat: 155 / 81

Let's proceed to step 4:
When dividing 155 by 81, we get 1 with a remainder of 74.
The next digit of our result is 1. 
Result so far: 51.0
If we subtract 81 from 155, we get 74.
Include the next digit (3) from the dividend after 74, then repeat: 743 / 81

Advancing to step 5:
The number 81 fits into 743 9 times, leaving a remainder of 14.
Put 9 as the next digit of the answer. 
Result so far: 519.0
Subtracting 729 from 743 leaves us with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 81

Going ahead to step 6:
81 can be fit into 145 1 times, resulting in a remainder of 64.
Record the quotient 1 as the next digit in the result. 
Result so far: 5191.0
Subtracting 81 from 145 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 7:
81 can be fit into 640 7 times, resulting in a remainder of 73.
The next digit of our result is 7. 
Result so far: 5191.7
Subtracting 567 from 640 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 8:
730 divided by 81 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 5191.79
Deduct 729 from 730 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
81 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 5191.79
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
When dividing 100 by 81, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 5191.7901
Subtracting 81 from 100 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 11:
190 divided by 81 is 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 5191.79012
If we take 162 away from 190, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 12:
81 can be fit into 280 3 times, resulting in a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 5191.790123
Deduct 243 from 280 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 13:
If we divide 370 by 81, we get 4 and a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 5191.7901234
Subtracting 324 from 370 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 14:
When dividing 460 by 81, we get 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 5191.79012345
If we take 405 away from 460, we end up 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.

The final outcome is 5191.79012345, with a leftover of 5.5e-08.