We look at the division of 663579 by 63 
The aim is to understand the frequency of 63 in 663579.

Going ahead to step 1:
When dividing 6 by 63, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 63

Let's proceed to step 2:
If we divide 66 by 63, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 63 from 66 leaves us with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 63

Step 3:
63 can be fit into 33 0 times, resulting in a remainder of 33.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we subtract 0 from 33, we get 33.
Grab the next digit (5) from the dividend, add it to 33, then carry on: 335 / 63

Going ahead to step 4:
63 can be fit into 335 5 times, resulting in a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 105.0
If we take 315 away from 335, we end up with 20.
Bring next digit (7) of the dividend behind the 20 and repeat the process: 207 / 63

Advancing to step 5:
207 divided by 63 is 3 with a remainder of 18.
Use 3 as the next digit of our solution. 
Result so far: 1053.0
The remainder is 18 after subtracting 189 from 207.
Grab the next digit (9) from the dividend, add it to 18, then carry on: 189 / 63

On to step 6:
When dividing 189 by 63, we get 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 10533.0
The remainder is 0 after subtracting 189 from 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
63 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 10533.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
When dividing 0 by 63, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10533.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 10533.0 with a remaining 0.0.