We divide 54121586 by 545
The aim is to understand the frequency of 545 in 54121586.

Going ahead to step 1:
If we divide 5 by 545, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 545

Going ahead to step 2:
The number 545 fits into 54 0 times, leaving a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 54 and we're left with 54.
Take the next digit (1) from the dividend and append it to 54, then repeat: 541 / 545

Going ahead to step 3:
If we divide 541 by 545, we get 0 and a remainder of 541.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 541 after subtracting 0 from 541.
Include the next digit (2) from the dividend after 541, then repeat: 5412 / 545

Step 4:
5412 divided by 545 is 9 with a remainder of 507.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 4905 from 5412 and we're left with 507.
Bring next digit (1) of the dividend behind the 507 and repeat the process: 5071 / 545

Moving on to step 5:
When dividing 5071 by 545, we get 9 with a remainder of 166.
The next digit of our result is 9. 
Result so far: 99.0
Subtract 4905 from 5071 to get 166.
Append the next digit (5) from the dividend to 166 and continue with: 1665 / 545

Advancing to step 6:
1665 divided by 545 is 3 with a remainder of 30.
The next digit of our result is 3. 
Result so far: 993.0
If we subtract 1635 from 1665, we get 30.
Include the next digit (8) from the dividend after 30, then repeat: 308 / 545

On to step 7:
545 goes into 308 0 times with a remainder of 308.
The next digit of our result is 0. 
Result so far: 9930.0
Subtracting 0 from 308 leaves us with 308.
Include the next digit (6) from the dividend after 308, then repeat: 3086 / 545

Advancing to step 8:
545 goes into 3086 5 times with a remainder of 361.
Use 5 as the next digit of our solution. 
Result so far: 99305.0
The remainder is 361 after subtracting 2725 from 3086.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

Going ahead to step 9:
545 goes into 3610 6 times with a remainder of 340.
The number 6 becomes the next digit in our result. 
Result so far: 99305.6
Subtracting 3270 from 3610 leaves us with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Moving on to step 10:
If we divide 3400 by 545, we get 6 and a remainder of 130.
Use 6 as the next digit of our solution. 
Result so far: 99305.66
Subtracting 3270 from 3400 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

The final outcome is 99305.66, with a leftover of 0.13.