We look at the division of 336490 by 81 
We want to divide 336490 by 81.

On to step 1:
81 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 81

Step 2:
81 can be fit into 33 0 times, resulting in a remainder of 33.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 33 and we're left with 33.
Grab the next digit (6) from the dividend, add it to 33, then carry on: 336 / 81

Going ahead to step 3:
If we divide 336 by 81, we get 4 and a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 324 from 336 to get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 81

On to step 4:
81 can be fit into 124 1 times, resulting in a remainder of 43.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
Subtracting 81 from 124 leaves us with 43.
Include the next digit (9) from the dividend after 43, then repeat: 439 / 81

Step 5:
If we divide 439 by 81, we get 5 and a remainder of 34.
Write down 5 as next digit of the result. 
Result so far: 415.0
Subtract 405 from 439 to get 34.
Fetch the next digit (0) from the dividend, attach it to 34 and continue: 340 / 81

Advancing to step 6:
81 can be fit into 340 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 4154.0
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 7:
81 can be fit into 160 1 times, resulting in a remainder of 79.
The number 1 becomes the next digit in our result. 
Result so far: 4154.1
Subtract 81 from 160 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 8:
The number 81 fits into 790 9 times, leaving a remainder of 61.
The number 9 becomes the next digit in our result. 
Result so far: 4154.19
The remainder is 61 after subtracting 729 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 9:
The number 81 fits into 610 7 times, leaving a remainder of 43.
The next digit of our result is 7. 
Result so far: 4154.197
The remainder is 43 after subtracting 567 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 10:
81 goes into 430 5 times with a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 4154.1975
Subtracting 405 from 430 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
81 can be fit into 250 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 4154.19753
If we subtract 243 from 250, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 12:
81 can be fit into 70 0 times, resulting in a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 4154.19753
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 13:
700 divided by 81 is 8 with a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 4154.1975308
If we take 648 away from 700, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 14:
If we divide 520 by 81, we get 6 and a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 4154.19753086
Subtract 486 from 520 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

In conclusion, the division gives 4154.19753086 with a balance of 3.4e-08.