981431 ÷ 18 
The aim is to understand the frequency of 18 in 981431.

Moving on to step 1:
18 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 18

Going ahead to step 2:
98 divided by 18 is 5 with a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 8 after subtracting 90 from 98.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 18

Let's proceed to step 3:
The number 18 fits into 81 4 times, leaving a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 54.0
Subtracting 72 from 81 leaves us with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 18

On to step 4:
18 goes into 94 5 times with a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 545.0
Subtracting 90 from 94 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 18

Going ahead to step 5:
18 goes into 43 2 times with a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 5452.0
Subtracting 36 from 43 leaves us with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 18

Advancing to step 6:
18 can be fit into 71 3 times, resulting in a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 54523.0
Subtract 54 from 71 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 7:
18 goes into 170 9 times with a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 54523.9
Subtracting 162 from 170 leaves us 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 8:
The number 18 fits into 80 4 times, leaving a remainder of 8.
The next digit of our result is 4. 
Result so far: 54523.94
If we take 72 away from 80, 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.

Moving on to step 9:
18 can be fit into 80 4 times, resulting in a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 54523.944
If we take 72 away from 80, 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.

The final outcome is 54523.944, with a leftover of 0.0008.