We're dividing 54780900 by 405 
The aim is to understand the frequency of 405 in 54780900.

On to step 1:
5 divided by 405 is 0 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.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 405

Let's proceed to step 2:
If we divide 54 by 405, we get 0 and a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 54 and we're left with 54.
Take the next digit (7) from the dividend and append it to 54, then repeat: 547 / 405

Step 3:
405 goes into 547 1 times with a remainder of 142.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 405 from 547 leaves us with 142.
Take the next digit (8) from the dividend and append it to 142, then repeat: 1428 / 405

On to step 4:
405 can be fit into 1428 3 times, resulting in a remainder of 213.
Use 3 as the next digit of our solution. 
Result so far: 13.0
The remainder is 213 after subtracting 1215 from 1428.
Include the next digit (0) from the dividend after 213, then repeat: 2130 / 405

Step 5:
If we divide 2130 by 405, we get 5 and a remainder of 105.
The next digit of our result is 5. 
Result so far: 135.0
If we subtract 2025 from 2130, we get 105.
Fetch the next digit (9) from the dividend, attach it to 105 and continue: 1059 / 405

Step 6:
When dividing 1059 by 405, we get 2 with a remainder of 249.
Write down 2 as next digit of the result. 
Result so far: 1352.0
Deduct 810 from 1059 and we're left with 249.
Bring next digit (0) of the dividend behind the 249 and repeat the process: 2490 / 405

Going ahead to step 7:
If we divide 2490 by 405, we get 6 and a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 13526.0
If we subtract 2430 from 2490, we get 60.
Append the next digit (0) from the dividend to 60 and continue with: 600 / 405

Advancing to step 8:
405 goes into 600 1 times with a remainder of 195.
The next digit of our result is 1. 
Result so far: 135261.0
Subtract 405 from 600 to get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Going ahead to step 9:
If we divide 1950 by 405, we get 4 and a remainder of 330.
Write down 4 as next digit of the result. 
Result so far: 135261.4
The remainder is 330 after subtracting 1620 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 10:
If we divide 3300 by 405, we get 8 and a remainder of 60.
The next digit of our result is 8. 
Result so far: 135261.48
If we take 3240 away from 3300, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 11:
405 can be fit into 600 1 times, resulting in a remainder of 195.
Write down 1 as next digit of the result. 
Result so far: 135261.481
Subtracting 405 from 600 leaves us with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Step 12:
When dividing 1950 by 405, we get 4 with a remainder of 330.
Record the quotient 4 as the next digit in the result. 
Result so far: 135261.4814
Deduct 1620 from 1950 and we're left with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Advancing to step 13:
If we divide 3300 by 405, we get 8 and a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 135261.48148
If we take 3240 away from 3300, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 14:
When dividing 600 by 405, we get 1 with a remainder of 195.
Write down 1 as next digit of the result. 
Result so far: 135261.481481
Subtract 405 from 600 to get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Step 15:
405 goes into 1950 4 times with a remainder of 330.
Record the quotient 4 as the next digit in the result. 
Result so far: 135261.4814814
Subtracting 1620 from 1950 leaves us with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Going ahead to step 16:
405 can be fit into 3300 8 times, resulting in a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 135261.48148148
If we subtract 3240 from 3300, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 135261.48148148 with a remainder of 6e-08.