636868 divided by 18 
The aim is to understand the frequency of 18 in 636868.

Advancing to step 1:
The number 18 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 18

Advancing to step 2:
When dividing 63 by 18, we get 3 with a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 9 after subtracting 54 from 63.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 18

On to step 3:
18 can be fit into 96 5 times, resulting in a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Subtracting 90 from 96 leaves us with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 18

On to step 4:
18 can be fit into 68 3 times, resulting in a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 353.0
If we take 54 away from 68, we end up with 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 18

Going ahead to step 5:
18 goes into 146 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 3538.0
Deduct 144 from 146 and we're left with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 18

Advancing to step 6:
18 goes into 28 1 times with a remainder of 10.
The next digit of our result is 1. 
Result so far: 35381.0
Subtracting 18 from 28 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
If we divide 100 by 18, we get 5 and a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 35381.5
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
18 can be fit into 100 5 times, resulting in a remainder of 10.
The next digit of our result is 5. 
Result so far: 35381.55
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 35381.55 and a remainder of 0.01.