98580518 divided by 398 
The aim is to understand the frequency of 398 in 98580518.

Let's proceed to step 1:
When dividing 9 by 398, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 398

Step 2:
398 goes into 98 0 times with a remainder of 98.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 98 after subtracting 0 from 98.
Take the next digit (5) from the dividend and append it to 98, then repeat: 985 / 398

Moving on to step 3:
The number 398 fits into 985 2 times, leaving a remainder of 189.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 796 from 985 and we're left with 189.
Take the next digit (8) from the dividend and append it to 189, then repeat: 1898 / 398

Moving on to step 4:
398 can be fit into 1898 4 times, resulting in a remainder of 306.
Write down 4 as next digit of the result. 
Result so far: 24.0
The remainder is 306 after subtracting 1592 from 1898.
Append the next digit (0) from the dividend to 306 and continue with: 3060 / 398

On to step 5:
398 goes into 3060 7 times with a remainder of 274.
The next digit of our result is 7. 
Result so far: 247.0
Subtract 2786 from 3060 to get 274.
Include the next digit (5) from the dividend after 274, then repeat: 2745 / 398

Step 6:
398 can be fit into 2745 6 times, resulting in a remainder of 357.
Put 6 as the next digit of the answer. 
Result so far: 2476.0
If we take 2388 away from 2745, we end up with 357.
Grab the next digit (1) from the dividend, add it to 357, then carry on: 3571 / 398

Moving on to step 7:
The number 398 fits into 3571 8 times, leaving a remainder of 387.
Put 8 as the next digit of the answer. 
Result so far: 24768.0
Deduct 3184 from 3571 and we're left with 387.
Include the next digit (8) from the dividend after 387, then repeat: 3878 / 398

Advancing to step 8:
When dividing 3878 by 398, we get 9 with a remainder of 296.
The next digit of our result is 9. 
Result so far: 247689.0
Subtracting 3582 from 3878 leaves us with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Going ahead to step 9:
398 goes into 2960 7 times with a remainder of 174.
Put 7 as the next digit of the answer. 
Result so far: 247689.7
Subtract 2786 from 2960 to get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

On to step 10:
When dividing 1740 by 398, we get 4 with a remainder of 148.
Write down 4 as next digit of the result. 
Result so far: 247689.74
Deduct 1592 from 1740 and we're left with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Step 11:
398 can be fit into 1480 3 times, resulting in a remainder of 286.
Use 3 as the next digit of our solution. 
Result so far: 247689.743
Deduct 1194 from 1480 and we're left with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 12:
The number 398 fits into 2860 7 times, leaving a remainder of 74.
Use 7 as the next digit of our solution. 
Result so far: 247689.7437
Subtracting 2786 from 2860 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 13:
740 divided by 398 is 1 with a remainder of 342.
Use 1 as the next digit of our solution. 
Result so far: 247689.74371
If we subtract 398 from 740, we get 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Moving on to step 14:
If we divide 3420 by 398, we get 8 and a remainder of 236.
The number 8 becomes the next digit in our result. 
Result so far: 247689.743718
If we take 3184 away from 3420, we end up with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

On to step 15:
The number 398 fits into 2360 5 times, leaving a remainder of 370.
Use 5 as the next digit of our solution. 
Result so far: 247689.7437185
If we take 1990 away from 2360, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 16:
398 can be fit into 3700 9 times, resulting in a remainder of 118.
Put 9 as the next digit of the answer. 
Result so far: 247689.74371859
Deduct 3582 from 3700 and we're left with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

The final outcome is 247689.74371859, with a leftover of 1.18e-07.