Let's divide 81321516 by 398
The aim is to understand the frequency of 398 in 81321516.

Going ahead to step 1:
398 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 398

On to step 2:
81 divided by 398 is 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Grab the next digit (3) from the dividend, add it to 81, then carry on: 813 / 398

On to step 3:
The number 398 fits into 813 2 times, leaving a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 796 from 813 to get 17.
Fetch the next digit (2) from the dividend, attach it to 17 and continue: 172 / 398

Going ahead to step 4:
If we divide 172 by 398, we get 0 and a remainder of 172.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Subtract 0 from 172 to get 172.
Grab the next digit (1) from the dividend, add it to 172, then carry on: 1721 / 398

Let's proceed to step 5:
If we divide 1721 by 398, we get 4 and a remainder of 129.
The next digit of our result is 4. 
Result so far: 204.0
Subtracting 1592 from 1721 leaves us with 129.
Fetch the next digit (5) from the dividend, attach it to 129 and continue: 1295 / 398

Moving on to step 6:
398 can be fit into 1295 3 times, resulting in a remainder of 101.
The next digit of our result is 3. 
Result so far: 2043.0
If we subtract 1194 from 1295, we get 101.
Fetch the next digit (1) from the dividend, attach it to 101 and continue: 1011 / 398

On to step 7:
The number 398 fits into 1011 2 times, leaving a remainder of 215.
Write down 2 as next digit of the result. 
Result so far: 20432.0
If we subtract 796 from 1011, we get 215.
Grab the next digit (6) from the dividend, add it to 215, then carry on: 2156 / 398

Advancing to step 8:
The number 398 fits into 2156 5 times, leaving a remainder of 166.
Use 5 as the next digit of our solution. 
Result so far: 204325.0
Subtracting 1990 from 2156 leaves us with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Moving on to step 9:
1660 divided by 398 is 4 with a remainder of 68.
The next digit of our result is 4. 
Result so far: 204325.4
The remainder is 68 after subtracting 1592 from 1660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 10:
The number 398 fits into 680 1 times, leaving a remainder of 282.
Write down 1 as next digit of the result. 
Result so far: 204325.41
Subtract 398 from 680 to get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 11:
When dividing 2820 by 398, we get 7 with a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 204325.417
If we subtract 2786 from 2820, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 12:
340 divided by 398 is 0 with a remainder of 340.
Record the quotient 0 as the next digit in the result. 
Result so far: 204325.417
If we subtract 0 from 340, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 13:
The number 398 fits into 3400 8 times, leaving a remainder of 216.
Record the quotient 8 as the next digit in the result. 
Result so far: 204325.41708
Subtracting 3184 from 3400 leaves us with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Let's proceed to step 14:
398 goes into 2160 5 times with a remainder of 170.
Write down 5 as next digit of the result. 
Result so far: 204325.417085
If we subtract 1990 from 2160, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 15:
398 can be fit into 1700 4 times, resulting in a remainder of 108.
Write down 4 as next digit of the result. 
Result so far: 204325.4170854
If we subtract 1592 from 1700, we get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Advancing to step 16:
When dividing 1080 by 398, we get 2 with a remainder of 284.
Put 2 as the next digit of the answer. 
Result so far: 204325.41708542
Deduct 796 from 1080 and we're left with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

The final result is 204325.41708542 with a remainder of 2.84e-07.