Let's divide 17438642 by 397
The aim is to understand the frequency of 397 in 17438642.

Going ahead to step 1:
When dividing 1 by 397, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 397

Going ahead to step 2:
397 goes into 17 0 times with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Take the next digit (4) from the dividend and append it to 17, then repeat: 174 / 397

Advancing to step 3:
174 divided by 397 is 0 with a remainder of 174.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 174, we get 174.
Include the next digit (3) from the dividend after 174, then repeat: 1743 / 397

Going ahead to step 4:
The number 397 fits into 1743 4 times, leaving a remainder of 155.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 1588 from 1743 to get 155.
Append the next digit (8) from the dividend to 155 and continue with: 1558 / 397

On to step 5:
The number 397 fits into 1558 3 times, leaving a remainder of 367.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Subtract 1191 from 1558 to get 367.
Bring next digit (6) of the dividend behind the 367 and repeat the process: 3676 / 397

Going ahead to step 6:
The number 397 fits into 3676 9 times, leaving a remainder of 103.
Put 9 as the next digit of the answer. 
Result so far: 439.0
Deduct 3573 from 3676 and we're left with 103.
Include the next digit (4) from the dividend after 103, then repeat: 1034 / 397

Going ahead to step 7:
If we divide 1034 by 397, we get 2 and a remainder of 240.
Use 2 as the next digit of our solution. 
Result so far: 4392.0
If we take 794 away from 1034, we end up with 240.
Take the next digit (2) from the dividend and append it to 240, then repeat: 2402 / 397

Advancing to step 8:
If we divide 2402 by 397, we get 6 and a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 43926.0
Subtracting 2382 from 2402 leaves us with 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 9:
200 divided by 397 is 0 with a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 43926.0
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 10:
When dividing 2000 by 397, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 43926.05
If we subtract 1985 from 2000, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 11:
397 goes into 150 0 times with a remainder of 150.
Record the quotient 0 as the next digit in the result. 
Result so far: 43926.05
If we take 0 away from 150, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Going ahead to step 12:
397 goes into 1500 3 times with a remainder of 309.
The number 3 becomes the next digit in our result. 
Result so far: 43926.0503
Deduct 1191 from 1500 and we're left with 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

Advancing to step 13:
397 can be fit into 3090 7 times, resulting in a remainder of 311.
Record the quotient 7 as the next digit in the result. 
Result so far: 43926.05037
If we take 2779 away from 3090, we end up with 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Step 14:
If we divide 3110 by 397, we get 7 and a remainder of 331.
The next digit of our result is 7. 
Result so far: 43926.050377
If we subtract 2779 from 3110, we get 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

The final result is 43926.050377 with a remainder of 3.31e-05.