Let's divide 687623 by 18
The aim is to understand the frequency of 18 in 687623.

Going ahead to step 1:
If we divide 6 by 18, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 18

Going ahead to step 2:
18 can be fit into 68 3 times, resulting in a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 54 from 68 leaves us with 14.
Include the next digit (7) from the dividend after 14, then repeat: 147 / 18

Step 3:
18 can be fit into 147 8 times, resulting in a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 38.0
The remainder is 3 after subtracting 144 from 147.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 18

Going ahead to step 4:
When dividing 36 by 18, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 382.0
Subtracting 36 from 36 leaves us with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 18

Let's proceed to step 5:
18 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 3820.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 18

Let's proceed to step 6:
18 goes into 23 1 times with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 38201.0
If we take 18 away from 23, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
If we divide 50 by 18, we get 2 and a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 38201.2
The remainder is 14 after subtracting 36 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
18 can be fit into 140 7 times, resulting in a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 38201.27
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
When dividing 140 by 18, we get 7 with a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 38201.277
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 38201.277 with a remainder of 0.0014.