We're dividing 74714751 by 399 
The aim is to understand the frequency of 399 in 74714751.

Step 1:
399 goes into 7 0 times with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (4) from the dividend to 7 and continue with: 74 / 399

On to step 2:
The number 399 fits into 74 0 times, leaving a remainder of 74.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 74, we get 74.
Fetch the next digit (7) from the dividend, attach it to 74 and continue: 747 / 399

On to step 3:
399 goes into 747 1 times with a remainder of 348.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 399 from 747 leaves us with 348.
Take the next digit (1) from the dividend and append it to 348, then repeat: 3481 / 399

Moving on to step 4:
If we divide 3481 by 399, we get 8 and a remainder of 289.
Use 8 as the next digit of our solution. 
Result so far: 18.0
Deduct 3192 from 3481 and we're left with 289.
Grab the next digit (4) from the dividend, add it to 289, then carry on: 2894 / 399

Let's proceed to step 5:
2894 divided by 399 is 7 with a remainder of 101.
Record the quotient 7 as the next digit in the result. 
Result so far: 187.0
The remainder is 101 after subtracting 2793 from 2894.
Include the next digit (7) from the dividend after 101, then repeat: 1017 / 399

Let's proceed to step 6:
The number 399 fits into 1017 2 times, leaving a remainder of 219.
The next digit of our result is 2. 
Result so far: 1872.0
Subtract 798 from 1017 to get 219.
Bring next digit (5) of the dividend behind the 219 and repeat the process: 2195 / 399

On to step 7:
When dividing 2195 by 399, we get 5 with a remainder of 200.
Use 5 as the next digit of our solution. 
Result so far: 18725.0
Subtract 1995 from 2195 to get 200.
Fetch the next digit (1) from the dividend, attach it to 200 and continue: 2001 / 399

Advancing to step 8:
If we divide 2001 by 399, we get 5 and a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 187255.0
The remainder is 6 after subtracting 1995 from 2001.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 9:
399 can be fit into 60 0 times, resulting in a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 187255.0
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
399 can be fit into 600 1 times, resulting in a remainder of 201.
The number 1 becomes the next digit in our result. 
Result so far: 187255.01
The remainder is 201 after subtracting 399 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Advancing to step 11:
2010 divided by 399 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 187255.015
The remainder is 15 after subtracting 1995 from 2010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
150 divided by 399 is 0 with a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 187255.015
The remainder is 150 after subtracting 0 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 13:
The number 399 fits into 1500 3 times, leaving a remainder of 303.
Write down 3 as next digit of the result. 
Result so far: 187255.01503
If we take 1197 away from 1500, we end up with 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Step 14:
If we divide 3030 by 399, we get 7 and a remainder of 237.
The next digit of our result is 7. 
Result so far: 187255.015037
If we subtract 2793 from 3030, we get 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

Step 15:
If we divide 2370 by 399, we get 5 and a remainder of 375.
Write down 5 as next digit of the result. 
Result so far: 187255.0150375
Deduct 1995 from 2370 and we're left with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Advancing to step 16:
399 goes into 3750 9 times with a remainder of 159.
The next digit of our result is 9. 
Result so far: 187255.01503759
The remainder is 159 after subtracting 3591 from 3750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

The final result is 187255.01503759 with a remainder of 1.59e-07.