We're dividing 35499213 by 399 
The aim is to understand the frequency of 399 in 35499213.

Going ahead to step 1:
The number 399 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 399

Moving on to step 2:
The number 399 fits into 35 0 times, leaving a remainder of 35.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 35, we end up with 35.
Grab the next digit (4) from the dividend, add it to 35, then carry on: 354 / 399

On to step 3:
399 can be fit into 354 0 times, resulting in a remainder of 354.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 354, we get 354.
Bring next digit (9) of the dividend behind the 354 and repeat the process: 3549 / 399

Going ahead to step 4:
3549 divided by 399 is 8 with a remainder of 357.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Deduct 3192 from 3549 and we're left with 357.
Take the next digit (9) from the dividend and append it to 357, then repeat: 3579 / 399

Let's proceed to step 5:
If we divide 3579 by 399, we get 8 and a remainder of 387.
Use 8 as the next digit of our solution. 
Result so far: 88.0
The remainder is 387 after subtracting 3192 from 3579.
Include the next digit (2) from the dividend after 387, then repeat: 3872 / 399

Moving on to step 6:
399 can be fit into 3872 9 times, resulting in a remainder of 281.
Put 9 as the next digit of the answer. 
Result so far: 889.0
The remainder is 281 after subtracting 3591 from 3872.
Grab the next digit (1) from the dividend, add it to 281, then carry on: 2811 / 399

On to step 7:
The number 399 fits into 2811 7 times, leaving a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 8897.0
Subtract 2793 from 2811 to get 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 399

Step 8:
The number 399 fits into 183 0 times, leaving a remainder of 183.
The next digit of our result is 0. 
Result so far: 88970.0
If we take 0 away from 183, we end up with 183.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

Let's proceed to step 9:
1830 divided by 399 is 4 with a remainder of 234.
The number 4 becomes the next digit in our result. 
Result so far: 88970.4
If we subtract 1596 from 1830, we get 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

On to step 10:
If we divide 2340 by 399, we get 5 and a remainder of 345.
Put 5 as the next digit of the answer. 
Result so far: 88970.45
Subtract 1995 from 2340 to get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Going ahead to step 11:
3450 divided by 399 is 8 with a remainder of 258.
Record the quotient 8 as the next digit in the result. 
Result so far: 88970.458
If we subtract 3192 from 3450, we get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Advancing to step 12:
When dividing 2580 by 399, we get 6 with a remainder of 186.
Write down 6 as next digit of the result. 
Result so far: 88970.4586
Deduct 2394 from 2580 and we're left with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

On to step 13:
399 can be fit into 1860 4 times, resulting in a remainder of 264.
The number 4 becomes the next digit in our result. 
Result so far: 88970.45864
If we subtract 1596 from 1860, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Let's proceed to step 14:
2640 divided by 399 is 6 with a remainder of 246.
Use 6 as the next digit of our solution. 
Result so far: 88970.458646
If we subtract 2394 from 2640, we get 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Let's proceed to step 15:
When dividing 2460 by 399, we get 6 with a remainder of 66.
Write down 6 as next digit of the result. 
Result so far: 88970.4586466
Subtract 2394 from 2460 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Our division results in 88970.4586466 with a remaining 6.6e-07.