616881 ÷ 18 
The aim is to understand the frequency of 18 in 616881.

Let's proceed to step 1:
18 can be fit into 6 0 times, resulting in 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.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 18

Going ahead to step 2:
The number 18 fits into 61 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 54 away from 61, we end up with 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 18

Let's proceed to step 3:
76 divided by 18 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 34.0
If we take 72 away from 76, we end up with 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 18

Step 4:
When dividing 48 by 18, we get 2 with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 342.0
If we subtract 36 from 48, we get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 18

Moving on to step 5:
The number 18 fits into 128 7 times, leaving a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 3427.0
Deduct 126 from 128 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 18

Advancing to step 6:
18 goes into 21 1 times with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 34271.0
The remainder is 3 after subtracting 18 from 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
18 goes into 30 1 times with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 34271.1
Subtract 18 from 30 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
18 goes into 120 6 times with a remainder of 12.
The next digit of our result is 6. 
Result so far: 34271.16
Subtract 108 from 120 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
When dividing 120 by 18, we get 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 34271.166
Subtract 108 from 120 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 34271.166, with a leftover of 0.0012.