685599 divided by 54 
The aim is to understand the frequency of 54 in 685599.

Advancing to step 1:
6 divided by 54 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 54

Step 2:
68 divided by 54 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 54 from 68, we get 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 54

Moving on to step 3:
145 divided by 54 is 2 with a remainder of 37.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 108 from 145, we get 37.
Take the next digit (5) from the dividend and append it to 37, then repeat: 375 / 54

Step 4:
54 can be fit into 375 6 times, resulting in a remainder of 51.
Write down 6 as next digit of the result. 
Result so far: 126.0
If we take 324 away from 375, we end up with 51.
Include the next digit (9) from the dividend after 51, then repeat: 519 / 54

Going ahead to step 5:
54 goes into 519 9 times with a remainder of 33.
Use 9 as the next digit of our solution. 
Result so far: 1269.0
Deduct 486 from 519 and we're left with 33.
Take the next digit (9) from the dividend and append it to 33, then repeat: 339 / 54

Step 6:
339 divided by 54 is 6 with a remainder of 15.
Put 6 as the next digit of the answer. 
Result so far: 12696.0
If we subtract 324 from 339, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
150 divided by 54 is 2 with a remainder of 42.
Record the quotient 2 as the next digit in the result. 
Result so far: 12696.2
Subtract 108 from 150 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 8:
If we divide 420 by 54, we get 7 and a remainder of 42.
Write down 7 as next digit of the result. 
Result so far: 12696.27
Subtract 378 from 420 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 9:
When dividing 420 by 54, we get 7 with a remainder of 42.
Write down 7 as next digit of the result. 
Result so far: 12696.277
If we take 378 away from 420, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The quotient of the division is 12696.277, and the remainder is 0.0042.