We look at the division of 669707 by 54 
The aim is to understand the frequency of 54 in 669707.

Let's proceed to step 1:
When dividing 6 by 54, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 54

Going ahead to step 2:
If we divide 66 by 54, we get 1 and a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 54 away from 66, we end up with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 54

Moving on to step 3:
If we divide 129 by 54, we get 2 and a remainder of 21.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtracting 108 from 129 leaves us with 21.
Append the next digit (7) from the dividend to 21 and continue with: 217 / 54

Moving on to step 4:
54 can be fit into 217 4 times, resulting in a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 124.0
Subtracting 216 from 217 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 54

Advancing to step 5:
54 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 1240.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (7) from the dividend and append it to 10, then repeat: 107 / 54

Advancing to step 6:
The number 54 fits into 107 1 times, leaving a remainder of 53.
Put 1 as the next digit of the answer. 
Result so far: 12401.0
The remainder is 53 after subtracting 54 from 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 7:
The number 54 fits into 530 9 times, leaving a remainder of 44.
Record the quotient 9 as the next digit in the result. 
Result so far: 12401.9
If we subtract 486 from 530, we 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.

Let's proceed to step 8:
440 divided by 54 is 8 with a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 12401.98
If we subtract 432 from 440, we 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.

Let's proceed to step 9:
When dividing 80 by 54, we get 1 with a remainder of 26.
Put 1 as the next digit of the answer. 
Result so far: 12401.981
Deduct 54 from 80 and we're left 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:
The number 54 fits into 260 4 times, leaving a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 12401.9814
Subtracting 216 from 260 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 11:
When dividing 440 by 54, we get 8 with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 12401.98148
Deduct 432 from 440 and we're left 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.

Going ahead to step 12:
80 divided by 54 is 1 with a remainder of 26.
The next digit of our result is 1. 
Result so far: 12401.981481
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.

Step 13:
54 can be fit into 260 4 times, resulting in a remainder of 44.
Write down 4 as next digit of the result. 
Result so far: 12401.9814814
Subtract 216 from 260 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.

Advancing to step 14:
54 can be fit into 440 8 times, resulting in a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 12401.98148148
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 outcome is 12401.98148148, with a leftover of 8e-09.