We divide 81394310 by 405
The aim is to understand the frequency of 405 in 81394310.

Going ahead to step 1:
When dividing 8 by 405, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 405

Moving on to step 2:
405 goes into 81 0 times with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Grab the next digit (3) from the dividend, add it to 81, then carry on: 813 / 405

Moving on to step 3:
813 divided by 405 is 2 with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 3 after subtracting 810 from 813.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 405

Advancing to step 4:
The number 405 fits into 39 0 times, leaving a remainder of 39.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 39 leaves us with 39.
Append the next digit (4) from the dividend to 39 and continue with: 394 / 405

Step 5:
When dividing 394 by 405, we get 0 with a remainder of 394.
Write down 0 as next digit of the result. 
Result so far: 200.0
Deduct 0 from 394 and we're left with 394.
Grab the next digit (3) from the dividend, add it to 394, then carry on: 3943 / 405

On to step 6:
405 can be fit into 3943 9 times, resulting in a remainder of 298.
Use 9 as the next digit of our solution. 
Result so far: 2009.0
Subtracting 3645 from 3943 leaves us with 298.
Bring next digit (1) of the dividend behind the 298 and repeat the process: 2981 / 405

Going ahead to step 7:
The number 405 fits into 2981 7 times, leaving a remainder of 146.
The number 7 becomes the next digit in our result. 
Result so far: 20097.0
If we take 2835 away from 2981, we end up with 146.
Include the next digit (0) from the dividend after 146, then repeat: 1460 / 405

Advancing to step 8:
The number 405 fits into 1460 3 times, leaving a remainder of 245.
The next digit of our result is 3. 
Result so far: 200973.0
Deduct 1215 from 1460 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Step 9:
If we divide 2450 by 405, we get 6 and a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 200973.6
Subtract 2430 from 2450 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
The number 405 fits into 200 0 times, leaving a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 200973.6
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 11:
2000 divided by 405 is 4 with a remainder of 380.
The next digit of our result is 4. 
Result so far: 200973.604
If we subtract 1620 from 2000, we get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Going ahead to step 12:
405 can be fit into 3800 9 times, resulting in a remainder of 155.
Use 9 as the next digit of our solution. 
Result so far: 200973.6049
If we subtract 3645 from 3800, we get 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Step 13:
When dividing 1550 by 405, we get 3 with a remainder of 335.
Put 3 as the next digit of the answer. 
Result so far: 200973.60493
Deduct 1215 from 1550 and we're left with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 14:
3350 divided by 405 is 8 with a remainder of 110.
The next digit of our result is 8. 
Result so far: 200973.604938
Subtract 3240 from 3350 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 15:
405 can be fit into 1100 2 times, resulting in a remainder of 290.
Record the quotient 2 as the next digit in the result. 
Result so far: 200973.6049382
Subtracting 810 from 1100 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 16:
405 goes into 2900 7 times with a remainder of 65.
Write down 7 as next digit of the result. 
Result so far: 200973.60493827
If we subtract 2835 from 2900, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

After the division, we end up with 200973.60493827 and a remainder of 6.5e-08.