34134283 ÷ 399 
The aim is to understand the frequency of 399 in 34134283.

Going ahead to step 1:
When dividing 3 by 399, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 399

Moving on to step 2:
399 goes into 34 0 times with a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 34 and we're left with 34.
Append the next digit (1) from the dividend to 34 and continue with: 341 / 399

On to step 3:
399 goes into 341 0 times with a remainder of 341.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 341 after subtracting 0 from 341.
Grab the next digit (3) from the dividend, add it to 341, then carry on: 3413 / 399

Moving on to step 4:
399 can be fit into 3413 8 times, resulting in a remainder of 221.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 3192 from 3413 to get 221.
Grab the next digit (4) from the dividend, add it to 221, then carry on: 2214 / 399

Moving on to step 5:
399 can be fit into 2214 5 times, resulting in a remainder of 219.
Record the quotient 5 as the next digit in the result. 
Result so far: 85.0
Deduct 1995 from 2214 and we're left with 219.
Append the next digit (2) from the dividend to 219 and continue with: 2192 / 399

Advancing to step 6:
The number 399 fits into 2192 5 times, leaving a remainder of 197.
Use 5 as the next digit of our solution. 
Result so far: 855.0
Subtract 1995 from 2192 to get 197.
Include the next digit (8) from the dividend after 197, then repeat: 1978 / 399

Going ahead to step 7:
1978 divided by 399 is 4 with a remainder of 382.
Write down 4 as next digit of the result. 
Result so far: 8554.0
The remainder is 382 after subtracting 1596 from 1978.
Fetch the next digit (3) from the dividend, attach it to 382 and continue: 3823 / 399

Step 8:
399 goes into 3823 9 times with a remainder of 232.
The next digit of our result is 9. 
Result so far: 85549.0
Subtracting 3591 from 3823 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 9:
The number 399 fits into 2320 5 times, leaving a remainder of 325.
The number 5 becomes the next digit in our result. 
Result so far: 85549.5
Deduct 1995 from 2320 and we're left with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Moving on to step 10:
3250 divided by 399 is 8 with a remainder of 58.
Write down 8 as next digit of the result. 
Result so far: 85549.58
Subtracting 3192 from 3250 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 11:
399 can be fit into 580 1 times, resulting in a remainder of 181.
Put 1 as the next digit of the answer. 
Result so far: 85549.581
If we subtract 399 from 580, we get 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Going ahead to step 12:
399 goes into 1810 4 times with a remainder of 214.
Use 4 as the next digit of our solution. 
Result so far: 85549.5814
Subtracting 1596 from 1810 leaves us with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Advancing to step 13:
When dividing 2140 by 399, we get 5 with a remainder of 145.
The number 5 becomes the next digit in our result. 
Result so far: 85549.58145
Subtracting 1995 from 2140 leaves us with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Moving on to step 14:
The number 399 fits into 1450 3 times, leaving a remainder of 253.
Write down 3 as next digit of the result. 
Result so far: 85549.581453
Subtract 1197 from 1450 to get 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Going ahead to step 15:
2530 divided by 399 is 6 with a remainder of 136.
The next digit of our result is 6. 
Result so far: 85549.5814536
Subtracting 2394 from 2530 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

On to step 16:
1360 divided by 399 is 3 with a remainder of 163.
Use 3 as the next digit of our solution. 
Result so far: 85549.58145363
Deduct 1197 from 1360 and we're left with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

The final outcome is 85549.58145363, with a leftover of 1.63e-07.