We look at the division of 8635823 by 849 
The aim is to understand the frequency of 849 in 8635823.

Moving on to step 1:
When dividing 8 by 849, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 849

Advancing to step 2:
If we divide 86 by 849, we get 0 and a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Grab the next digit (3) from the dividend, add it to 86, then carry on: 863 / 849

Let's proceed to step 3:
849 goes into 863 1 times with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 849 from 863 to get 14.
Include the next digit (5) from the dividend after 14, then repeat: 145 / 849

Moving on to step 4:
When dividing 145 by 849, we get 0 with a remainder of 145.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 145 leaves us with 145.
Append the next digit (8) from the dividend to 145 and continue with: 1458 / 849

Moving on to step 5:
The number 849 fits into 1458 1 times, leaving a remainder of 609.
Put 1 as the next digit of the answer. 
Result so far: 101.0
Subtract 849 from 1458 to get 609.
Fetch the next digit (2) from the dividend, attach it to 609 and continue: 6092 / 849

Let's proceed to step 6:
When dividing 6092 by 849, we get 7 with a remainder of 149.
Record the quotient 7 as the next digit in the result. 
Result so far: 1017.0
If we subtract 5943 from 6092, we get 149.
Append the next digit (3) from the dividend to 149 and continue with: 1493 / 849

Step 7:
The number 849 fits into 1493 1 times, leaving a remainder of 644.
The next digit of our result is 1. 
Result so far: 10171.0
If we take 849 away from 1493, we end up with 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Step 8:
When dividing 6440 by 849, we get 7 with a remainder of 497.
Put 7 as the next digit of the answer. 
Result so far: 10171.7
If we subtract 5943 from 6440, we get 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Going ahead to step 9:
If we divide 4970 by 849, we get 5 and a remainder of 725.
Write down 5 as next digit of the result. 
Result so far: 10171.75
Deduct 4245 from 4970 and we're left with 725.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7250, and continue the process.

Advancing to step 10:
7250 divided by 849 is 8 with a remainder of 458.
Put 8 as the next digit of the answer. 
Result so far: 10171.758
Deduct 6792 from 7250 and we're left with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

On to step 11:
If we divide 4580 by 849, we get 5 and a remainder of 335.
The number 5 becomes the next digit in our result. 
Result so far: 10171.7585
Subtract 4245 from 4580 to get 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 12:
849 can be fit into 3350 3 times, resulting in a remainder of 803.
Write down 3 as next digit of the result. 
Result so far: 10171.75853
Subtract 2547 from 3350 to get 803.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8030, and continue the process.

On to step 13:
If we divide 8030 by 849, we get 9 and a remainder of 389.
Write down 9 as next digit of the result. 
Result so far: 10171.758539
If we subtract 7641 from 8030, we get 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Going ahead to step 14:
849 goes into 3890 4 times with a remainder of 494.
Write down 4 as next digit of the result. 
Result so far: 10171.7585394
Subtract 3396 from 3890 to get 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

Moving on to step 15:
849 can be fit into 4940 5 times, resulting in a remainder of 695.
The number 5 becomes the next digit in our result. 
Result so far: 10171.75853945
Subtract 4245 from 4940 to get 695.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6950, and continue the process.

The final outcome is 10171.75853945, with a leftover of 6.95e-07.