We look at the division of 99859215 by 853 
The aim is to understand the frequency of 853 in 99859215.

Going ahead to step 1:
If we divide 9 by 853, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 853

Step 2:
If we divide 99 by 853, we get 0 and a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Bring next digit (8) of the dividend behind the 99 and repeat the process: 998 / 853

Step 3:
If we divide 998 by 853, we get 1 and a remainder of 145.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 145 after subtracting 853 from 998.
Grab the next digit (5) from the dividend, add it to 145, then carry on: 1455 / 853

On to step 4:
853 goes into 1455 1 times with a remainder of 602.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 853 from 1455 to get 602.
Bring next digit (9) of the dividend behind the 602 and repeat the process: 6029 / 853

Moving on to step 5:
If we divide 6029 by 853, we get 7 and a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 117.0
Deduct 5971 from 6029 and we're left with 58.
Grab the next digit (2) from the dividend, add it to 58, then carry on: 582 / 853

Going ahead to step 6:
853 can be fit into 582 0 times, resulting in a remainder of 582.
Record the quotient 0 as the next digit in the result. 
Result so far: 1170.0
Deduct 0 from 582 and we're left with 582.
Bring next digit (1) of the dividend behind the 582 and repeat the process: 5821 / 853

Let's proceed to step 7:
853 can be fit into 5821 6 times, resulting in a remainder of 703.
Write down 6 as next digit of the result. 
Result so far: 11706.0
Subtract 5118 from 5821 to get 703.
Grab the next digit (5) from the dividend, add it to 703, then carry on: 7035 / 853

Step 8:
7035 divided by 853 is 8 with a remainder of 211.
The next digit of our result is 8. 
Result so far: 117068.0
The remainder is 211 after subtracting 6824 from 7035.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Step 9:
2110 divided by 853 is 2 with a remainder of 404.
The number 2 becomes the next digit in our result. 
Result so far: 117068.2
Subtracting 1706 from 2110 leaves us with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Let's proceed to step 10:
If we divide 4040 by 853, we get 4 and a remainder of 628.
Record the quotient 4 as the next digit in the result. 
Result so far: 117068.24
If we take 3412 away from 4040, we end up with 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 11:
The number 853 fits into 6280 7 times, leaving a remainder of 309.
Write down 7 as next digit of the result. 
Result so far: 117068.247
Subtract 5971 from 6280 to get 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

Going ahead to step 12:
The number 853 fits into 3090 3 times, leaving a remainder of 531.
The next digit of our result is 3. 
Result so far: 117068.2473
Subtracting 2559 from 3090 leaves us with 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5310, and continue the process.

On to step 13:
5310 divided by 853 is 6 with a remainder of 192.
The next digit of our result is 6. 
Result so far: 117068.24736
The remainder is 192 after subtracting 5118 from 5310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Advancing to step 14:
The number 853 fits into 1920 2 times, leaving a remainder of 214.
Put 2 as the next digit of the answer. 
Result so far: 117068.247362
Subtract 1706 from 1920 to get 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

On to step 15:
The number 853 fits into 2140 2 times, leaving a remainder of 434.
The number 2 becomes the next digit in our result. 
Result so far: 117068.2473622
Subtract 1706 from 2140 to get 434.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

The final outcome is 117068.2473622, with a leftover of 4.34e-06.