Let's divide 77107636 by 399
The aim is to understand the frequency of 399 in 77107636.

Step 1:
399 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 399

Moving on to step 2:
399 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 77 leaves us with 77.
Fetch the next digit (1) from the dividend, attach it to 77 and continue: 771 / 399

Going ahead to step 3:
771 divided by 399 is 1 with a remainder of 372.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 399 from 771 leaves us with 372.
Take the next digit (0) from the dividend and append it to 372, then repeat: 3720 / 399

Going ahead to step 4:
If we divide 3720 by 399, we get 9 and a remainder of 129.
The next digit of our result is 9. 
Result so far: 19.0
If we subtract 3591 from 3720, we get 129.
Take the next digit (7) from the dividend and append it to 129, then repeat: 1297 / 399

Going ahead to step 5:
399 goes into 1297 3 times with a remainder of 100.
Record the quotient 3 as the next digit in the result. 
Result so far: 193.0
If we take 1197 away from 1297, we end up with 100.
Bring next digit (6) of the dividend behind the 100 and repeat the process: 1006 / 399

On to step 6:
399 goes into 1006 2 times with a remainder of 208.
Put 2 as the next digit of the answer. 
Result so far: 1932.0
Subtracting 798 from 1006 leaves us with 208.
Grab the next digit (3) from the dividend, add it to 208, then carry on: 2083 / 399

Going ahead to step 7:
399 goes into 2083 5 times with a remainder of 88.
Write down 5 as next digit of the result. 
Result so far: 19325.0
If we take 1995 away from 2083, we end up with 88.
Include the next digit (6) from the dividend after 88, then repeat: 886 / 399

Moving on to step 8:
The number 399 fits into 886 2 times, leaving a remainder of 88.
Write down 2 as next digit of the result. 
Result so far: 193252.0
Deduct 798 from 886 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 9:
399 can be fit into 880 2 times, resulting in a remainder of 82.
Use 2 as the next digit of our solution. 
Result so far: 193252.2
Deduct 798 from 880 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 10:
When dividing 820 by 399, we get 2 with a remainder of 22.
Put 2 as the next digit of the answer. 
Result so far: 193252.22
Deduct 798 from 820 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

In conclusion, the division gives 193252.22 with a balance of 0.022.