We look at the division of 645383 by 63 
The aim is to understand the frequency of 63 in 645383.

Moving on to step 1:
63 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 63

Step 2:
If we divide 64 by 63, we get 1 and a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 63 from 64, we get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 63

Moving on to step 3:
15 divided by 63 is 0 with a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 15 and we're left with 15.
Bring next digit (3) of the dividend behind the 15 and repeat the process: 153 / 63

Advancing to step 4:
63 can be fit into 153 2 times, resulting in a remainder of 27.
Use 2 as the next digit of our solution. 
Result so far: 102.0
Deduct 126 from 153 and we're left with 27.
Grab the next digit (8) from the dividend, add it to 27, then carry on: 278 / 63

Going ahead to step 5:
The number 63 fits into 278 4 times, leaving a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 1024.0
If we take 252 away from 278, we end up with 26.
Grab the next digit (3) from the dividend, add it to 26, then carry on: 263 / 63

Step 6:
If we divide 263 by 63, we get 4 and a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 10244.0
If we take 252 away from 263, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
63 can be fit into 110 1 times, resulting in a remainder of 47.
Record the quotient 1 as the next digit in the result. 
Result so far: 10244.1
Subtracting 63 from 110 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 8:
When dividing 470 by 63, we get 7 with a remainder of 29.
Use 7 as the next digit of our solution. 
Result so far: 10244.17
The remainder is 29 after subtracting 441 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 9:
The number 63 fits into 290 4 times, leaving a remainder of 38.
Use 4 as the next digit of our solution. 
Result so far: 10244.174
Subtract 252 from 290 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 10:
63 goes into 380 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 10244.1746
Deduct 378 from 380 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
63 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 10244.1746
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 12:
63 can be fit into 200 3 times, resulting in a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 10244.174603
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 13:
The number 63 fits into 110 1 times, leaving a remainder of 47.
The number 1 becomes the next digit in our result. 
Result so far: 10244.1746031
If we subtract 63 from 110, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 14:
63 can be fit into 470 7 times, resulting in a remainder of 29.
The next digit of our result is 7. 
Result so far: 10244.17460317
Deduct 441 from 470 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 10244.17460317 with a remainder of 2.9e-08.