We're dividing 80358648 by 998 
The aim is to understand the frequency of 998 in 80358648.

Step 1:
If we divide 8 by 998, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 998

Moving on to step 2:
998 goes into 80 0 times with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Take the next digit (3) from the dividend and append it to 80, then repeat: 803 / 998

Let's proceed to step 3:
When dividing 803 by 998, we get 0 with a remainder of 803.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 803 to get 803.
Include the next digit (5) from the dividend after 803, then repeat: 8035 / 998

Moving on to step 4:
The number 998 fits into 8035 8 times, leaving a remainder of 51.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 7984 from 8035 leaves us with 51.
Append the next digit (8) from the dividend to 51 and continue with: 518 / 998

On to step 5:
998 can be fit into 518 0 times, resulting in a remainder of 518.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
Deduct 0 from 518 and we're left with 518.
Include the next digit (6) from the dividend after 518, then repeat: 5186 / 998

Going ahead to step 6:
The number 998 fits into 5186 5 times, leaving a remainder of 196.
Record the quotient 5 as the next digit in the result. 
Result so far: 805.0
The remainder is 196 after subtracting 4990 from 5186.
Fetch the next digit (4) from the dividend, attach it to 196 and continue: 1964 / 998

Going ahead to step 7:
When dividing 1964 by 998, we get 1 with a remainder of 966.
Put 1 as the next digit of the answer. 
Result so far: 8051.0
Deduct 998 from 1964 and we're left with 966.
Append the next digit (8) from the dividend to 966 and continue with: 9668 / 998

On to step 8:
998 can be fit into 9668 9 times, resulting in a remainder of 686.
Use 9 as the next digit of our solution. 
Result so far: 80519.0
If we take 8982 away from 9668, we end up with 686.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6860, and continue the process.

Moving on to step 9:
6860 divided by 998 is 6 with a remainder of 872.
Write down 6 as next digit of the result. 
Result so far: 80519.6
If we subtract 5988 from 6860, we get 872.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8720, and continue the process.

Step 10:
998 can be fit into 8720 8 times, resulting in a remainder of 736.
Use 8 as the next digit of our solution. 
Result so far: 80519.68
If we subtract 7984 from 8720, we get 736.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7360, and continue the process.

On to step 11:
If we divide 7360 by 998, we get 7 and a remainder of 374.
Put 7 as the next digit of the answer. 
Result so far: 80519.687
Deduct 6986 from 7360 and we're left with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Moving on to step 12:
When dividing 3740 by 998, we get 3 with a remainder of 746.
The next digit of our result is 3. 
Result so far: 80519.6873
Subtracting 2994 from 3740 leaves us with 746.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7460, and continue the process.

Moving on to step 13:
When dividing 7460 by 998, we get 7 with a remainder of 474.
The next digit of our result is 7. 
Result so far: 80519.68737
Deduct 6986 from 7460 and we're left with 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Advancing to step 14:
4740 divided by 998 is 4 with a remainder of 748.
The next digit of our result is 4. 
Result so far: 80519.687374
Subtract 3992 from 4740 to get 748.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7480, and continue the process.

Step 15:
The number 998 fits into 7480 7 times, leaving a remainder of 494.
Put 7 as the next digit of the answer. 
Result so far: 80519.6873747
If we take 6986 away from 7480, we end up with 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

Step 16:
The number 998 fits into 4940 4 times, leaving a remainder of 948.
Write down 4 as next digit of the result. 
Result so far: 80519.68737474
If we subtract 3992 from 4940, we get 948.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9480, and continue the process.

The final outcome is 80519.68737474, with a leftover of 9.48e-07.