426221 ÷ 54 
The aim is to understand the frequency of 54 in 426221.

Let's proceed to step 1:
If we divide 4 by 54, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 54

Advancing to step 2:
If we divide 42 by 54, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Bring next digit (6) of the dividend behind the 42 and repeat the process: 426 / 54

On to step 3:
If we divide 426 by 54, we get 7 and a remainder of 48.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 48 after subtracting 378 from 426.
Append the next digit (2) from the dividend to 48 and continue with: 482 / 54

Step 4:
The number 54 fits into 482 8 times, leaving a remainder of 50.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
Subtract 432 from 482 to get 50.
Bring next digit (2) of the dividend behind the 50 and repeat the process: 502 / 54

On to step 5:
The number 54 fits into 502 9 times, leaving a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 789.0
Subtract 486 from 502 to get 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 54

Step 6:
161 divided by 54 is 2 with a remainder of 53.
Record the quotient 2 as the next digit in the result. 
Result so far: 7892.0
Deduct 108 from 161 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 7:
When dividing 530 by 54, we get 9 with a remainder of 44.
The next digit of our result is 9. 
Result so far: 7892.9
Subtract 486 from 530 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 8:
When dividing 440 by 54, we get 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 7892.98
If we take 432 away from 440, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
When dividing 80 by 54, we get 1 with a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 7892.981
Subtracting 54 from 80 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 10:
If we divide 260 by 54, we get 4 and a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 7892.9814
The remainder is 44 after subtracting 216 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 11:
The number 54 fits into 440 8 times, leaving a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 7892.98148
The remainder is 8 after subtracting 432 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 12:
54 can be fit into 80 1 times, resulting in a remainder of 26.
Put 1 as the next digit of the answer. 
Result so far: 7892.981481
If we take 54 away from 80, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 13:
260 divided by 54 is 4 with a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 7892.9814814
The remainder is 44 after subtracting 216 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 14:
If we divide 440 by 54, we get 8 and a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 7892.98148148
Subtract 432 from 440 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 7892.98148148 with a remainder of 8e-09.