Let's divide 8610099 by 398
The aim is to understand the frequency of 398 in 8610099.

Let's proceed to step 1:
If we divide 8 by 398, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 398

Let's proceed to step 2:
If we divide 86 by 398, we get 0 and a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Include the next digit (1) from the dividend after 86, then repeat: 861 / 398

Let's proceed to step 3:
861 divided by 398 is 2 with a remainder of 65.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 65 after subtracting 796 from 861.
Bring next digit (0) of the dividend behind the 65 and repeat the process: 650 / 398

Going ahead to step 4:
The number 398 fits into 650 1 times, leaving a remainder of 252.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 398 from 650 leaves us with 252.
Bring next digit (0) of the dividend behind the 252 and repeat the process: 2520 / 398

Going ahead to step 5:
398 goes into 2520 6 times with a remainder of 132.
Record the quotient 6 as the next digit in the result. 
Result so far: 216.0
Deduct 2388 from 2520 and we're left with 132.
Fetch the next digit (9) from the dividend, attach it to 132 and continue: 1329 / 398

Moving on to step 6:
1329 divided by 398 is 3 with a remainder of 135.
Use 3 as the next digit of our solution. 
Result so far: 2163.0
If we take 1194 away from 1329, we end up with 135.
Bring next digit (9) of the dividend behind the 135 and repeat the process: 1359 / 398

Advancing to step 7:
1359 divided by 398 is 3 with a remainder of 165.
Write down 3 as next digit of the result. 
Result so far: 21633.0
If we subtract 1194 from 1359, we get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Advancing to step 8:
When dividing 1650 by 398, we get 4 with a remainder of 58.
Use 4 as the next digit of our solution. 
Result so far: 21633.4
If we subtract 1592 from 1650, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 9:
When dividing 580 by 398, we get 1 with a remainder of 182.
Write down 1 as next digit of the result. 
Result so far: 21633.41
Deduct 398 from 580 and we're left with 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

On to step 10:
If we divide 1820 by 398, we get 4 and a remainder of 228.
The number 4 becomes the next digit in our result. 
Result so far: 21633.414
The remainder is 228 after subtracting 1592 from 1820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Moving on to step 11:
398 goes into 2280 5 times with a remainder of 290.
The next digit of our result is 5. 
Result so far: 21633.4145
If we subtract 1990 from 2280, we get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 12:
If we divide 2900 by 398, we get 7 and a remainder of 114.
Write down 7 as next digit of the result. 
Result so far: 21633.41457
Subtract 2786 from 2900 to get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Let's proceed to step 13:
The number 398 fits into 1140 2 times, leaving a remainder of 344.
Use 2 as the next digit of our solution. 
Result so far: 21633.414572
If we take 796 away from 1140, we end up with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Let's proceed to step 14:
The number 398 fits into 3440 8 times, leaving a remainder of 256.
Put 8 as the next digit of the answer. 
Result so far: 21633.4145728
The remainder is 256 after subtracting 3184 from 3440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Advancing to step 15:
398 can be fit into 2560 6 times, resulting in a remainder of 172.
Put 6 as the next digit of the answer. 
Result so far: 21633.41457286
Deduct 2388 from 2560 and we're left with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

The final result is 21633.41457286 with a remainder of 1.72e-07.