We're dividing 871205 by 84 
The aim is to understand the frequency of 84 in 871205.

On to step 1:
When dividing 8 by 84, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 84

On to step 2:
84 goes into 87 1 times with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 3 after subtracting 84 from 87.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 84

Let's proceed to step 3:
84 goes into 31 0 times with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 31 and we're left with 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 84

Moving on to step 4:
84 goes into 312 3 times with a remainder of 60.
Put 3 as the next digit of the answer. 
Result so far: 103.0
Subtracting 252 from 312 leaves us with 60.
Bring next digit (0) of the dividend behind the 60 and repeat the process: 600 / 84

On to step 5:
84 can be fit into 600 7 times, resulting in a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 1037.0
If we take 588 away from 600, we end up with 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 84

Step 6:
84 goes into 125 1 times with a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 10371.0
If we subtract 84 from 125, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 7:
If we divide 410 by 84, we get 4 and a remainder of 74.
Record the quotient 4 as the next digit in the result. 
Result so far: 10371.4
The remainder is 74 after subtracting 336 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 8:
The number 84 fits into 740 8 times, leaving a remainder of 68.
Put 8 as the next digit of the answer. 
Result so far: 10371.48
Subtracting 672 from 740 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 9:
The number 84 fits into 680 8 times, leaving a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 10371.488
Deduct 672 from 680 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 10371.488, with a leftover of 0.0008.