We divide 684251 by 18
The aim is to understand the frequency of 18 in 684251.

Going ahead to step 1:
If we divide 6 by 18, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 18

On to step 2:
18 goes into 68 3 times with a remainder of 14.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 14 after subtracting 54 from 68.
Append the next digit (4) from the dividend to 14 and continue with: 144 / 18

On to step 3:
When dividing 144 by 18, we get 8 with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 38.0
The remainder is 0 after subtracting 144 from 144.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 18

Let's proceed to step 4:
18 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 380.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 18

Advancing to step 5:
When dividing 25 by 18, we get 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 3801.0
Deduct 18 from 25 and we're left with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 18

On to step 6:
18 can be fit into 71 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 38013.0
If we take 54 away from 71, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 7:
If we divide 170 by 18, we get 9 and a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 38013.9
Deduct 162 from 170 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.

Advancing to step 8:
80 divided by 18 is 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 38013.94
Deduct 72 from 80 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.

On to step 9:
18 goes into 80 4 times with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 38013.944
Deduct 72 from 80 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.

Our division results in 38013.944 with a remaining 0.0008.