We're dividing 51899383 by 405 
The aim is to understand the frequency of 405 in 51899383.

Advancing to step 1:
405 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 405

Going ahead to step 2:
When dividing 51 by 405, we get 0 with a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 405

On to step 3:
405 goes into 518 1 times with a remainder of 113.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 113 after subtracting 405 from 518.
Fetch the next digit (9) from the dividend, attach it to 113 and continue: 1139 / 405

Let's proceed to step 4:
If we divide 1139 by 405, we get 2 and a remainder of 329.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 329 after subtracting 810 from 1139.
Include the next digit (9) from the dividend after 329, then repeat: 3299 / 405

Moving on to step 5:
405 can be fit into 3299 8 times, resulting in a remainder of 59.
Write down 8 as next digit of the result. 
Result so far: 128.0
The remainder is 59 after subtracting 3240 from 3299.
Take the next digit (3) from the dividend and append it to 59, then repeat: 593 / 405

Going ahead to step 6:
405 goes into 593 1 times with a remainder of 188.
The number 1 becomes the next digit in our result. 
Result so far: 1281.0
Subtracting 405 from 593 leaves us with 188.
Include the next digit (8) from the dividend after 188, then repeat: 1888 / 405

Moving on to step 7:
405 can be fit into 1888 4 times, resulting in a remainder of 268.
Put 4 as the next digit of the answer. 
Result so far: 12814.0
If we subtract 1620 from 1888, we get 268.
Fetch the next digit (3) from the dividend, attach it to 268 and continue: 2683 / 405

Moving on to step 8:
405 goes into 2683 6 times with a remainder of 253.
The next digit of our result is 6. 
Result so far: 128146.0
If we take 2430 away from 2683, we end up with 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Step 9:
405 can be fit into 2530 6 times, resulting in a remainder of 100.
The number 6 becomes the next digit in our result. 
Result so far: 128146.6
If we subtract 2430 from 2530, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 10:
When dividing 1000 by 405, we get 2 with a remainder of 190.
The number 2 becomes the next digit in our result. 
Result so far: 128146.62
Subtract 810 from 1000 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Moving on to step 11:
1900 divided by 405 is 4 with a remainder of 280.
The next digit of our result is 4. 
Result so far: 128146.624
Subtracting 1620 from 1900 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 12:
405 goes into 2800 6 times with a remainder of 370.
Put 6 as the next digit of the answer. 
Result so far: 128146.6246
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.

Moving on to step 13:
When dividing 3700 by 405, we get 9 with a remainder of 55.
The number 9 becomes the next digit in our result. 
Result so far: 128146.62469
Deduct 3645 from 3700 and we're left 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.

Going ahead to step 14:
550 divided by 405 is 1 with a remainder of 145.
Put 1 as the next digit of the answer. 
Result so far: 128146.624691
If we take 405 away from 550, we end up with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Advancing to step 15:
If we divide 1450 by 405, we get 3 and a remainder of 235.
The next digit of our result is 3. 
Result so far: 128146.6246913
Subtract 1215 from 1450 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Moving on to step 16:
The number 405 fits into 2350 5 times, leaving a remainder of 325.
Record the quotient 5 as the next digit in the result. 
Result so far: 128146.62469135
If we take 2025 away from 2350, we end up 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.

Our division results in 128146.62469135 with a remaining 3.25e-07.