We look at the division of 615222 by 54 
The aim is to understand the frequency of 54 in 615222.

Step 1:
If we divide 6 by 54, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 54

Step 2:
54 goes into 61 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 54 from 61 to get 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 54

Going ahead to step 3:
54 can be fit into 75 1 times, resulting in a remainder of 21.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 54 from 75 leaves us with 21.
Fetch the next digit (2) from the dividend, attach it to 21 and continue: 212 / 54

Going ahead to step 4:
If we divide 212 by 54, we get 3 and a remainder of 50.
The next digit of our result is 3. 
Result so far: 113.0
Subtract 162 from 212 to get 50.
Bring next digit (2) of the dividend behind the 50 and repeat the process: 502 / 54

Moving on to step 5:
54 goes into 502 9 times with a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 1139.0
Subtracting 486 from 502 leaves us with 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 54

On to step 6:
The number 54 fits into 162 3 times, leaving a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 11393.0
Deduct 162 from 162 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
If we divide 0 by 54, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 11393.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
The number 54 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 11393.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 11393.0 with a remaining 0.0.