We're dividing 53939665 by 405 
The aim is to understand the frequency of 405 in 53939665.

Step 1:
405 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 405

Step 2:
53 divided by 405 is 0 with a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Include the next digit (9) from the dividend after 53, then repeat: 539 / 405

Advancing to step 3:
405 can be fit into 539 1 times, resulting in a remainder of 134.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 405 from 539 and we're left with 134.
Append the next digit (3) from the dividend to 134 and continue with: 1343 / 405

Step 4:
When dividing 1343 by 405, we get 3 with a remainder of 128.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtract 1215 from 1343 to get 128.
Append the next digit (9) from the dividend to 128 and continue with: 1289 / 405

Advancing to step 5:
405 goes into 1289 3 times with a remainder of 74.
Use 3 as the next digit of our solution. 
Result so far: 133.0
If we take 1215 away from 1289, we end up with 74.
Grab the next digit (6) from the dividend, add it to 74, then carry on: 746 / 405

Step 6:
If we divide 746 by 405, we get 1 and a remainder of 341.
Write down 1 as next digit of the result. 
Result so far: 1331.0
Subtract 405 from 746 to get 341.
Fetch the next digit (6) from the dividend, attach it to 341 and continue: 3416 / 405

Step 7:
If we divide 3416 by 405, we get 8 and a remainder of 176.
The number 8 becomes the next digit in our result. 
Result so far: 13318.0
Subtracting 3240 from 3416 leaves us with 176.
Bring next digit (5) of the dividend behind the 176 and repeat the process: 1765 / 405

Let's proceed to step 8:
If we divide 1765 by 405, we get 4 and a remainder of 145.
Put 4 as the next digit of the answer. 
Result so far: 133184.0
Subtract 1620 from 1765 to get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Moving on to step 9:
The number 405 fits into 1450 3 times, leaving a remainder of 235.
Put 3 as the next digit of the answer. 
Result so far: 133184.3
Deduct 1215 from 1450 and we're left with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 10:
2350 divided by 405 is 5 with a remainder of 325.
Write down 5 as next digit of the result. 
Result so far: 133184.35
Subtracting 2025 from 2350 leaves us with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Step 11:
3250 divided by 405 is 8 with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 133184.358
If we subtract 3240 from 3250, 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 12:
405 goes into 100 0 times with a remainder of 100.
Use 0 as the next digit of our solution. 
Result so far: 133184.358
The remainder is 100 after subtracting 0 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 13:
The number 405 fits into 1000 2 times, leaving a remainder of 190.
Record the quotient 2 as the next digit in the result. 
Result so far: 133184.35802
Subtracting 810 from 1000 leaves us with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

On to step 14:
If we divide 1900 by 405, we get 4 and a remainder of 280.
Record the quotient 4 as the next digit in the result. 
Result so far: 133184.358024
Subtract 1620 from 1900 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 15:
The number 405 fits into 2800 6 times, leaving a remainder of 370.
Write down 6 as next digit of the result. 
Result so far: 133184.3580246
If we subtract 2430 from 2800, we get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

On to step 16:
The number 405 fits into 3700 9 times, leaving a remainder of 55.
Write down 9 as next digit of the result. 
Result so far: 133184.35802469
If we take 3645 away from 3700, 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 quotient of the division is 133184.35802469, and the remainder is 5.5e-08.