We look at the division of 39142921 by 396 
The aim is to understand the frequency of 396 in 39142921.

On to step 1:
396 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 396

Step 2:
The number 396 fits into 39 0 times, leaving a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 396

Going ahead to step 3:
396 can be fit into 391 0 times, resulting in a remainder of 391.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 391 and we're left with 391.
Append the next digit (4) from the dividend to 391 and continue with: 3914 / 396

On to step 4:
When dividing 3914 by 396, we get 9 with a remainder of 350.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 3564 from 3914 leaves us with 350.
Append the next digit (2) from the dividend to 350 and continue with: 3502 / 396

On to step 5:
If we divide 3502 by 396, we get 8 and a remainder of 334.
The number 8 becomes the next digit in our result. 
Result so far: 98.0
If we subtract 3168 from 3502, we get 334.
Grab the next digit (9) from the dividend, add it to 334, then carry on: 3349 / 396

Step 6:
396 goes into 3349 8 times with a remainder of 181.
Write down 8 as next digit of the result. 
Result so far: 988.0
Subtract 3168 from 3349 to get 181.
Take the next digit (2) from the dividend and append it to 181, then repeat: 1812 / 396

Advancing to step 7:
If we divide 1812 by 396, we get 4 and a remainder of 228.
The number 4 becomes the next digit in our result. 
Result so far: 9884.0
The remainder is 228 after subtracting 1584 from 1812.
Grab the next digit (1) from the dividend, add it to 228, then carry on: 2281 / 396

Advancing to step 8:
2281 divided by 396 is 5 with a remainder of 301.
The number 5 becomes the next digit in our result. 
Result so far: 98845.0
If we subtract 1980 from 2281, we get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Step 9:
When dividing 3010 by 396, we get 7 with a remainder of 238.
The number 7 becomes the next digit in our result. 
Result so far: 98845.7
The remainder is 238 after subtracting 2772 from 3010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Let's proceed to step 10:
2380 divided by 396 is 6 with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 98845.76
Subtracting 2376 from 2380 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.

Moving on to step 11:
When dividing 40 by 396, we get 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 98845.76
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 12:
When dividing 400 by 396, we get 1 with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 98845.7601
Deduct 396 from 400 and we're left 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.

Moving on to step 13:
If we divide 40 by 396, we get 0 and a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 98845.7601
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 14:
396 can be fit into 400 1 times, resulting in a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 98845.760101
If we subtract 396 from 400, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 15:
When dividing 40 by 396, we get 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 98845.760101
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 16:
When dividing 400 by 396, we get 1 with a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 98845.76010101
If we subtract 396 from 400, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 98845.76010101 with a balance of 4e-09.