We look at the division of 61521900 by 633 
The aim is to understand the frequency of 633 in 61521900.

On to step 1:
633 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 633

Let's proceed to step 2:
61 divided by 633 is 0 with a remainder of 61.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 61, we end up with 61.
Include the next digit (5) from the dividend after 61, then repeat: 615 / 633

On to step 3:
615 divided by 633 is 0 with a remainder of 615.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 615 to get 615.
Bring next digit (2) of the dividend behind the 615 and repeat the process: 6152 / 633

Moving on to step 4:
The number 633 fits into 6152 9 times, leaving a remainder of 455.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 5697 from 6152 to get 455.
Bring next digit (1) of the dividend behind the 455 and repeat the process: 4551 / 633

Moving on to step 5:
633 goes into 4551 7 times with a remainder of 120.
The number 7 becomes the next digit in our result. 
Result so far: 97.0
Deduct 4431 from 4551 and we're left with 120.
Include the next digit (9) from the dividend after 120, then repeat: 1209 / 633

Let's proceed to step 6:
The number 633 fits into 1209 1 times, leaving a remainder of 576.
Write down 1 as next digit of the result. 
Result so far: 971.0
Subtracting 633 from 1209 leaves us with 576.
Include the next digit (0) from the dividend after 576, then repeat: 5760 / 633

Moving on to step 7:
If we divide 5760 by 633, we get 9 and a remainder of 63.
Put 9 as the next digit of the answer. 
Result so far: 9719.0
If we subtract 5697 from 5760, we get 63.
Bring next digit (0) of the dividend behind the 63 and repeat the process: 630 / 633

Advancing to step 8:
633 goes into 630 0 times with a remainder of 630.
The number 0 becomes the next digit in our result. 
Result so far: 97190.0
Deduct 0 from 630 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Advancing to step 9:
The number 633 fits into 6300 9 times, leaving a remainder of 603.
Record the quotient 9 as the next digit in the result. 
Result so far: 97190.9
Subtracting 5697 from 6300 leaves us with 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

On to step 10:
6030 divided by 633 is 9 with a remainder of 333.
The next digit of our result is 9. 
Result so far: 97190.99
The remainder is 333 after subtracting 5697 from 6030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

After the division, we end up with 97190.99 and a remainder of 0.333.