We look at the division of 637883 by 18 
The aim is to understand the frequency of 18 in 637883.

Let's proceed to step 1:
6 divided by 18 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 18

Step 2:
The number 18 fits into 63 3 times, leaving a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 54 from 63 and we're left with 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 18

Let's proceed to step 3:
18 goes into 97 5 times with a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
The remainder is 7 after subtracting 90 from 97.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 18

Advancing to step 4:
The number 18 fits into 78 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 354.0
Deduct 72 from 78 and we're left with 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 18

Moving on to step 5:
When dividing 68 by 18, we get 3 with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 3543.0
Deduct 54 from 68 and we're left with 14.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 18

Advancing to step 6:
If we divide 143 by 18, we get 7 and a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 35437.0
Subtracting 126 from 143 leaves us 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.

Going ahead to step 7:
If we divide 170 by 18, we get 9 and a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 35437.9
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.

On to step 8:
The number 18 fits into 80 4 times, leaving a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 35437.94
The remainder is 8 after subtracting 72 from 80.
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:
The number 18 fits into 80 4 times, leaving a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 35437.944
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 35437.944 with a balance of 0.0008.