99501203 ÷ 231 
The aim is to understand the frequency of 231 in 99501203.

Let's proceed to step 1:
231 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 231

Going ahead to step 2:
The number 231 fits into 99 0 times, leaving a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 99, we get 99.
Fetch the next digit (5) from the dividend, attach it to 99 and continue: 995 / 231

On to step 3:
231 can be fit into 995 4 times, resulting in a remainder of 71.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 924 from 995 to get 71.
Fetch the next digit (0) from the dividend, attach it to 71 and continue: 710 / 231

Step 4:
710 divided by 231 is 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Deduct 693 from 710 and we're left with 17.
Take the next digit (1) from the dividend and append it to 17, then repeat: 171 / 231

Moving on to step 5:
231 goes into 171 0 times with a remainder of 171.
The number 0 becomes the next digit in our result. 
Result so far: 430.0
Subtract 0 from 171 to get 171.
Bring next digit (2) of the dividend behind the 171 and repeat the process: 1712 / 231

Moving on to step 6:
231 goes into 1712 7 times with a remainder of 95.
Write down 7 as next digit of the result. 
Result so far: 4307.0
Deduct 1617 from 1712 and we're left with 95.
Append the next digit (0) from the dividend to 95 and continue with: 950 / 231

On to step 7:
950 divided by 231 is 4 with a remainder of 26.
The next digit of our result is 4. 
Result so far: 43074.0
If we subtract 924 from 950, we get 26.
Grab the next digit (3) from the dividend, add it to 26, then carry on: 263 / 231

Advancing to step 8:
231 goes into 263 1 times with a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 430741.0
The remainder is 32 after subtracting 231 from 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 9:
If we divide 320 by 231, we get 1 and a remainder of 89.
The next digit of our result is 1. 
Result so far: 430741.1
Subtracting 231 from 320 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 10:
When dividing 890 by 231, we get 3 with a remainder of 197.
Use 3 as the next digit of our solution. 
Result so far: 430741.13
Subtracting 693 from 890 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Let's proceed to step 11:
1970 divided by 231 is 8 with a remainder of 122.
The next digit of our result is 8. 
Result so far: 430741.138
Deduct 1848 from 1970 and we're left with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Advancing to step 12:
1220 divided by 231 is 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 430741.1385
Subtract 1155 from 1220 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 13:
When dividing 650 by 231, we get 2 with a remainder of 188.
Record the quotient 2 as the next digit in the result. 
Result so far: 430741.13852
If we subtract 462 from 650, we get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 14:
1880 divided by 231 is 8 with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 430741.138528
Subtracting 1848 from 1880 leaves us 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.

Advancing to step 15:
231 goes into 320 1 times with a remainder of 89.
Record the quotient 1 as the next digit in the result. 
Result so far: 430741.1385281
If we subtract 231 from 320, we get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 16:
890 divided by 231 is 3 with a remainder of 197.
The next digit of our result is 3. 
Result so far: 430741.13852813
If we subtract 693 from 890, we get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

The final outcome is 430741.13852813, with a leftover of 1.97e-07.