We look at the division of 13443821 by 397 
The aim is to understand the frequency of 397 in 13443821.

Advancing to step 1:
397 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 397

Going ahead to step 2:
397 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 397

Moving on to step 3:
397 can be fit into 134 0 times, resulting in a remainder of 134.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 134 leaves us with 134.
Append the next digit (4) from the dividend to 134 and continue with: 1344 / 397

Step 4:
When dividing 1344 by 397, we get 3 with a remainder of 153.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 1191 from 1344 and we're left with 153.
Take the next digit (3) from the dividend and append it to 153, then repeat: 1533 / 397

On to step 5:
397 can be fit into 1533 3 times, resulting in a remainder of 342.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
If we subtract 1191 from 1533, we get 342.
Include the next digit (8) from the dividend after 342, then repeat: 3428 / 397

Going ahead to step 6:
When dividing 3428 by 397, we get 8 with a remainder of 252.
Use 8 as the next digit of our solution. 
Result so far: 338.0
If we subtract 3176 from 3428, we get 252.
Fetch the next digit (2) from the dividend, attach it to 252 and continue: 2522 / 397

Moving on to step 7:
When dividing 2522 by 397, we get 6 with a remainder of 140.
The number 6 becomes the next digit in our result. 
Result so far: 3386.0
If we subtract 2382 from 2522, we get 140.
Grab the next digit (1) from the dividend, add it to 140, then carry on: 1401 / 397

Going ahead to step 8:
397 can be fit into 1401 3 times, resulting in a remainder of 210.
The number 3 becomes the next digit in our result. 
Result so far: 33863.0
Subtracting 1191 from 1401 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Advancing to step 9:
397 can be fit into 2100 5 times, resulting in a remainder of 115.
Use 5 as the next digit of our solution. 
Result so far: 33863.5
If we subtract 1985 from 2100, we get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Step 10:
397 can be fit into 1150 2 times, resulting in a remainder of 356.
Write down 2 as next digit of the result. 
Result so far: 33863.52
If we take 794 away from 1150, we end up with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Going ahead to step 11:
If we divide 3560 by 397, we get 8 and a remainder of 384.
Use 8 as the next digit of our solution. 
Result so far: 33863.528
The remainder is 384 after subtracting 3176 from 3560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

On to step 12:
397 can be fit into 3840 9 times, resulting in a remainder of 267.
Write down 9 as next digit of the result. 
Result so far: 33863.5289
Subtract 3573 from 3840 to get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Let's proceed to step 13:
When dividing 2670 by 397, we get 6 with a remainder of 288.
Record the quotient 6 as the next digit in the result. 
Result so far: 33863.52896
Subtracting 2382 from 2670 leaves us with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Let's proceed to step 14:
If we divide 2880 by 397, we get 7 and a remainder of 101.
Write down 7 as next digit of the result. 
Result so far: 33863.528967
The remainder is 101 after subtracting 2779 from 2880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Moving on to step 15:
The number 397 fits into 1010 2 times, leaving a remainder of 216.
The number 2 becomes the next digit in our result. 
Result so far: 33863.5289672
Deduct 794 from 1010 and we're left 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.

Advancing to step 16:
When dividing 2160 by 397, we get 5 with a remainder of 175.
The number 5 becomes the next digit in our result. 
Result so far: 33863.52896725
Subtract 1985 from 2160 to get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Our division results in 33863.52896725 with a remaining 1.75e-07.