We look at the division of 96754358 by 399 
The aim is to understand the frequency of 399 in 96754358.

Advancing to step 1:
The number 399 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 399

Step 2:
399 can be fit into 96 0 times, resulting in a remainder of 96.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 96 leaves us with 96.
Take the next digit (7) from the dividend and append it to 96, then repeat: 967 / 399

Going ahead to step 3:
967 divided by 399 is 2 with a remainder of 169.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 798 from 967 leaves us with 169.
Include the next digit (5) from the dividend after 169, then repeat: 1695 / 399

Going ahead to step 4:
399 can be fit into 1695 4 times, resulting in a remainder of 99.
The next digit of our result is 4. 
Result so far: 24.0
Subtract 1596 from 1695 to get 99.
Bring next digit (4) of the dividend behind the 99 and repeat the process: 994 / 399

Going ahead to step 5:
The number 399 fits into 994 2 times, leaving a remainder of 196.
Write down 2 as next digit of the result. 
Result so far: 242.0
Subtracting 798 from 994 leaves us with 196.
Append the next digit (3) from the dividend to 196 and continue with: 1963 / 399

Going ahead to step 6:
399 can be fit into 1963 4 times, resulting in a remainder of 367.
The number 4 becomes the next digit in our result. 
Result so far: 2424.0
Subtracting 1596 from 1963 leaves us with 367.
Append the next digit (5) from the dividend to 367 and continue with: 3675 / 399

Advancing to step 7:
If we divide 3675 by 399, we get 9 and a remainder of 84.
Use 9 as the next digit of our solution. 
Result so far: 24249.0
If we take 3591 away from 3675, we end up with 84.
Fetch the next digit (8) from the dividend, attach it to 84 and continue: 848 / 399

Advancing to step 8:
399 can be fit into 848 2 times, resulting in a remainder of 50.
Record the quotient 2 as the next digit in the result. 
Result so far: 242492.0
The remainder is 50 after subtracting 798 from 848.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
The number 399 fits into 500 1 times, leaving a remainder of 101.
Write down 1 as next digit of the result. 
Result so far: 242492.1
If we subtract 399 from 500, we get 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Let's proceed to step 10:
399 can be fit into 1010 2 times, resulting in a remainder of 212.
Put 2 as the next digit of the answer. 
Result so far: 242492.12
If we take 798 away from 1010, we end up with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Moving on to step 11:
399 goes into 2120 5 times with a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 242492.125
Subtract 1995 from 2120 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Advancing to step 12:
The number 399 fits into 1250 3 times, leaving a remainder of 53.
Put 3 as the next digit of the answer. 
Result so far: 242492.1253
Deduct 1197 from 1250 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 13:
399 can be fit into 530 1 times, resulting in a remainder of 131.
Record the quotient 1 as the next digit in the result. 
Result so far: 242492.12531
If we subtract 399 from 530, we get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Step 14:
1310 divided by 399 is 3 with a remainder of 113.
Use 3 as the next digit of our solution. 
Result so far: 242492.125313
If we subtract 1197 from 1310, we get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Advancing to step 15:
The number 399 fits into 1130 2 times, leaving a remainder of 332.
Record the quotient 2 as the next digit in the result. 
Result so far: 242492.1253132
Subtracting 798 from 1130 leaves us with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Going ahead to step 16:
The number 399 fits into 3320 8 times, leaving a remainder of 128.
Put 8 as the next digit of the answer. 
Result so far: 242492.12531328
If we take 3192 away from 3320, we end up with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

The final result is 242492.12531328 with a remainder of 1.28e-07.