We're dividing 16518369 by 63 
The aim is to understand the frequency of 63 in 16518369.

On to step 1:
63 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 63

Advancing to step 2:
When dividing 16 by 63, we get 0 with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 63

Moving on to step 3:
If we divide 165 by 63, we get 2 and a remainder of 39.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 126 from 165 and we're left with 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 63

Moving on to step 4:
391 divided by 63 is 6 with a remainder of 13.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
Subtracting 378 from 391 leaves us with 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 63

On to step 5:
63 goes into 138 2 times with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 262.0
Subtract 126 from 138 to get 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 63

Going ahead to step 6:
The number 63 fits into 123 1 times, leaving a remainder of 60.
Put 1 as the next digit of the answer. 
Result so far: 2621.0
Subtract 63 from 123 to get 60.
Fetch the next digit (6) from the dividend, attach it to 60 and continue: 606 / 63

Moving on to step 7:
606 divided by 63 is 9 with a remainder of 39.
Write down 9 as next digit of the result. 
Result so far: 26219.0
Subtract 567 from 606 to get 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 63

Moving on to step 8:
63 goes into 399 6 times with a remainder of 21.
Write down 6 as next digit of the result. 
Result so far: 262196.0
The remainder is 21 after subtracting 378 from 399.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 9:
The number 63 fits into 210 3 times, leaving a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 262196.3
The remainder is 21 after subtracting 189 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 10:
63 goes into 210 3 times with a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 262196.33
If we take 189 away from 210, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Our division results in 262196.33 with a remaining 0.021.