391235 ÷ 81 
We're looking to find how many times 81 goes into 391235.

Let's proceed to step 1:
81 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 81

Advancing to step 2:
When dividing 39 by 81, we get 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (1) from the dividend after 39, then repeat: 391 / 81

On to step 3:
81 goes into 391 4 times with a remainder of 67.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 67 after subtracting 324 from 391.
Include the next digit (2) from the dividend after 67, then repeat: 672 / 81

Moving on to step 4:
672 divided by 81 is 8 with a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Subtracting 648 from 672 leaves us with 24.
Include the next digit (3) from the dividend after 24, then repeat: 243 / 81

On to step 5:
The number 81 fits into 243 3 times, leaving a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 483.0
If we subtract 243 from 243, we get 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 81

Advancing to step 6:
81 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 4830.0
If we subtract 0 from 5, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
81 goes into 50 0 times with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 4830.0
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.

Going ahead to step 8:
500 divided by 81 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 4830.06
The remainder is 14 after subtracting 486 from 500.
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 9:
The number 81 fits into 140 1 times, leaving a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 4830.061
If we subtract 81 from 140, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 10:
When dividing 590 by 81, we get 7 with a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 4830.0617
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.

Advancing to step 11:
The number 81 fits into 230 2 times, leaving a remainder of 68.
Put 2 as the next digit of the answer. 
Result so far: 4830.06172
The remainder is 68 after subtracting 162 from 230.
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 12:
81 goes into 680 8 times with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 4830.061728
Subtract 648 from 680 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 13:
The number 81 fits into 320 3 times, leaving a remainder of 77.
Use 3 as the next digit of our solution. 
Result so far: 4830.0617283
If we subtract 243 from 320, we 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 14:
770 divided by 81 is 9 with a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 4830.06172839
The remainder is 41 after subtracting 729 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

The final result is 4830.06172839 with a remainder of 4.1e-08.