We're dividing 90213989 by 63 
The aim is to understand the frequency of 63 in 90213989.

Moving on to step 1:
9 divided by 63 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 63

Moving on to step 2:
63 can be fit into 90 1 times, resulting in a remainder of 27.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 63 from 90 leaves us with 27.
Bring next digit (2) of the dividend behind the 27 and repeat the process: 272 / 63

Going ahead to step 3:
If we divide 272 by 63, we get 4 and a remainder of 20.
The next digit of our result is 4. 
Result so far: 14.0
Deduct 252 from 272 and we're left with 20.
Grab the next digit (1) from the dividend, add it to 20, then carry on: 201 / 63

Step 4:
201 divided by 63 is 3 with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 143.0
Subtract 189 from 201 to get 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 63

Moving on to step 5:
63 goes into 123 1 times with a remainder of 60.
Put 1 as the next digit of the answer. 
Result so far: 1431.0
If we subtract 63 from 123, we get 60.
Append the next digit (9) from the dividend to 60 and continue with: 609 / 63

Going ahead to step 6:
If we divide 609 by 63, we get 9 and a remainder of 42.
The number 9 becomes the next digit in our result. 
Result so far: 14319.0
Deduct 567 from 609 and we're left with 42.
Include the next digit (8) from the dividend after 42, then repeat: 428 / 63

Going ahead to step 7:
428 divided by 63 is 6 with a remainder of 50.
Write down 6 as next digit of the result. 
Result so far: 143196.0
The remainder is 50 after subtracting 378 from 428.
Bring next digit (9) of the dividend behind the 50 and repeat the process: 509 / 63

Going ahead to step 8:
If we divide 509 by 63, we get 8 and a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 1431968.0
Deduct 504 from 509 and we're left 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.

Going ahead to step 9:
When dividing 50 by 63, we get 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 1431968.0
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 10:
The number 63 fits into 500 7 times, leaving a remainder of 59.
Use 7 as the next digit of our solution. 
Result so far: 1431968.07
The remainder is 59 after subtracting 441 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 11:
When dividing 590 by 63, we get 9 with a remainder of 23.
Write down 9 as next digit of the result. 
Result so far: 1431968.079
If we subtract 567 from 590, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 12:
63 can be fit into 230 3 times, resulting in a remainder of 41.
Use 3 as the next digit of our solution. 
Result so far: 1431968.0793
Subtract 189 from 230 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 13:
When dividing 410 by 63, we get 6 with a remainder of 32.
Put 6 as the next digit of the answer. 
Result so far: 1431968.07936
Deduct 378 from 410 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 14:
320 divided by 63 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 1431968.079365
Deduct 315 from 320 and we're left 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.

Step 15:
The number 63 fits into 50 0 times, leaving a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 1431968.079365
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 16:
63 goes into 500 7 times with a remainder of 59.
Write down 7 as next digit of the result. 
Result so far: 1431968.07936507
Deduct 441 from 500 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

After the division, we end up with 1431968.07936507 and a remainder of 5.9e-08.