We look at the division of 861870 by 83 
The aim is to understand the frequency of 83 in 861870.

Advancing to step 1:
The number 83 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 83

Advancing to step 2:
The number 83 fits into 86 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 83 away from 86, we end up with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 83

On to step 3:
83 goes into 31 0 times with a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 31 after subtracting 0 from 31.
Bring next digit (8) of the dividend behind the 31 and repeat the process: 318 / 83

Let's proceed to step 4:
83 can be fit into 318 3 times, resulting in a remainder of 69.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
If we take 249 away from 318, we end up with 69.
Append the next digit (7) from the dividend to 69 and continue with: 697 / 83

Advancing to step 5:
697 divided by 83 is 8 with a remainder of 33.
The number 8 becomes the next digit in our result. 
Result so far: 1038.0
Subtract 664 from 697 to get 33.
Fetch the next digit (0) from the dividend, attach it to 33 and continue: 330 / 83

Let's proceed to step 6:
If we divide 330 by 83, we get 3 and a remainder of 81.
Record the quotient 3 as the next digit in the result. 
Result so far: 10383.0
Subtract 249 from 330 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 7:
83 can be fit into 810 9 times, resulting in a remainder of 63.
Use 9 as the next digit of our solution. 
Result so far: 10383.9
If we take 747 away from 810, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 8:
The number 83 fits into 630 7 times, leaving a remainder of 49.
Use 7 as the next digit of our solution. 
Result so far: 10383.97
If we subtract 581 from 630, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 9:
If we divide 490 by 83, we get 5 and a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 10383.975
The remainder is 75 after subtracting 415 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 10:
83 goes into 750 9 times with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 10383.9759
The remainder is 3 after subtracting 747 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
83 can be fit into 30 0 times, resulting in a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 10383.9759
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 12:
If we divide 300 by 83, we get 3 and a remainder of 51.
Put 3 as the next digit of the answer. 
Result so far: 10383.975903
Subtracting 249 from 300 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 13:
83 goes into 510 6 times with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 10383.9759036
If we take 498 away from 510, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
83 goes into 120 1 times with a remainder of 37.
Use 1 as the next digit of our solution. 
Result so far: 10383.97590361
If we subtract 83 from 120, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

The final outcome is 10383.97590361, with a leftover of 3.7e-08.