81171782 ÷ 398 
The aim is to understand the frequency of 398 in 81171782.

Step 1:
The number 398 fits into 8 0 times, leaving 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 (1) from the dividend, add it to 8, then carry on: 81 / 398

Going ahead to step 2:
398 can be fit into 81 0 times, resulting in a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Take the next digit (1) from the dividend and append it to 81, then repeat: 811 / 398

Moving on to step 3:
When dividing 811 by 398, we get 2 with a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 796 from 811 leaves us with 15.
Fetch the next digit (7) from the dividend, attach it to 15 and continue: 157 / 398

Advancing to step 4:
When dividing 157 by 398, we get 0 with a remainder of 157.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Subtract 0 from 157 to get 157.
Include the next digit (1) from the dividend after 157, then repeat: 1571 / 398

Going ahead to step 5:
398 can be fit into 1571 3 times, resulting in a remainder of 377.
Record the quotient 3 as the next digit in the result. 
Result so far: 203.0
Deduct 1194 from 1571 and we're left with 377.
Take the next digit (7) from the dividend and append it to 377, then repeat: 3777 / 398

Going ahead to step 6:
If we divide 3777 by 398, we get 9 and a remainder of 195.
Write down 9 as next digit of the result. 
Result so far: 2039.0
The remainder is 195 after subtracting 3582 from 3777.
Include the next digit (8) from the dividend after 195, then repeat: 1958 / 398

Moving on to step 7:
398 can be fit into 1958 4 times, resulting in a remainder of 366.
Write down 4 as next digit of the result. 
Result so far: 20394.0
Deduct 1592 from 1958 and we're left with 366.
Grab the next digit (2) from the dividend, add it to 366, then carry on: 3662 / 398

Going ahead to step 8:
If we divide 3662 by 398, we get 9 and a remainder of 80.
Put 9 as the next digit of the answer. 
Result so far: 203949.0
If we subtract 3582 from 3662, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
The number 398 fits into 800 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 203949.2
Subtracting 796 from 800 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
398 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 203949.2
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 11:
400 divided by 398 is 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 203949.201
The remainder is 2 after subtracting 398 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 12:
The number 398 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 203949.201
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
When dividing 200 by 398, we get 0 with a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 203949.201
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The quotient of the division is 203949.201, and the remainder is 0.0002.