We look at the division of 88235680 by 399 
The aim is to understand the frequency of 399 in 88235680.

Step 1:
If we divide 8 by 399, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 399

Advancing to step 2:
The number 399 fits into 88 0 times, leaving a remainder of 88.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 88 and we're left with 88.
Append the next digit (2) from the dividend to 88 and continue with: 882 / 399

Step 3:
The number 399 fits into 882 2 times, leaving a remainder of 84.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 798 from 882 to get 84.
Grab the next digit (3) from the dividend, add it to 84, then carry on: 843 / 399

Going ahead to step 4:
When dividing 843 by 399, we get 2 with a remainder of 45.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
Subtract 798 from 843 to get 45.
Bring next digit (5) of the dividend behind the 45 and repeat the process: 455 / 399

Advancing to step 5:
399 goes into 455 1 times with a remainder of 56.
The next digit of our result is 1. 
Result so far: 221.0
The remainder is 56 after subtracting 399 from 455.
Grab the next digit (6) from the dividend, add it to 56, then carry on: 566 / 399

Advancing to step 6:
The number 399 fits into 566 1 times, leaving a remainder of 167.
The number 1 becomes the next digit in our result. 
Result so far: 2211.0
Subtract 399 from 566 to get 167.
Include the next digit (8) from the dividend after 167, then repeat: 1678 / 399

Going ahead to step 7:
399 goes into 1678 4 times with a remainder of 82.
Write down 4 as next digit of the result. 
Result so far: 22114.0
Deduct 1596 from 1678 and we're left with 82.
Bring next digit (0) of the dividend behind the 82 and repeat the process: 820 / 399

Advancing to step 8:
399 goes into 820 2 times with a remainder of 22.
Write down 2 as next digit of the result. 
Result so far: 221142.0
Subtracting 798 from 820 leaves us 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.

Moving on to step 9:
The number 399 fits into 220 0 times, leaving a remainder of 220.
The number 0 becomes the next digit in our result. 
Result so far: 221142.0
Deduct 0 from 220 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 10:
When dividing 2200 by 399, we get 5 with a remainder of 205.
Write down 5 as next digit of the result. 
Result so far: 221142.05
If we subtract 1995 from 2200, we get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Advancing to step 11:
399 goes into 2050 5 times with a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 221142.055
If we subtract 1995 from 2050, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Our division results in 221142.055 with a remaining 0.0055.