We divide 684988 by 18
The aim is to understand the frequency of 18 in 684988.

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
Deduct 0 from 6 and we're left with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 18

Going ahead to step 2:
If we divide 68 by 18, we get 3 and a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 54 away from 68, we end up with 14.
Grab the next digit (4) from the dividend, add it to 14, then carry on: 144 / 18

Let's proceed to step 3:
If we divide 144 by 18, we get 8 and a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 38.0
The remainder is 0 after subtracting 144 from 144.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 18

Moving on to step 4:
The number 18 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 380.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 18

Let's proceed to step 5:
The number 18 fits into 98 5 times, leaving a remainder of 8.
The next digit of our result is 5. 
Result so far: 3805.0
Subtracting 90 from 98 leaves us with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 18

Step 6:
18 goes into 88 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 38054.0
Subtracting 72 from 88 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
When dividing 160 by 18, we get 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 38054.8
Subtract 144 from 160 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 8:
When dividing 160 by 18, we get 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 38054.88
Deduct 144 from 160 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 38054.88, with a leftover of 0.016.