853431 divided by 84 
The aim is to understand the frequency of 84 in 853431.

Let's proceed to step 1:
When dividing 8 by 84, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 84

Advancing to step 2:
When dividing 85 by 84, we get 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 84 from 85 to get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 84

Moving on to step 3:
84 can be fit into 13 0 times, resulting in a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Deduct 0 from 13 and we're left with 13.
Grab the next digit (4) from the dividend, add it to 13, then carry on: 134 / 84

Advancing to step 4:
84 can be fit into 134 1 times, resulting in a remainder of 50.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
Deduct 84 from 134 and we're left with 50.
Bring next digit (3) of the dividend behind the 50 and repeat the process: 503 / 84

Step 5:
When dividing 503 by 84, we get 5 with a remainder of 83.
Use 5 as the next digit of our solution. 
Result so far: 1015.0
The remainder is 83 after subtracting 420 from 503.
Grab the next digit (1) from the dividend, add it to 83, then carry on: 831 / 84

Advancing to step 6:
The number 84 fits into 831 9 times, leaving a remainder of 75.
Put 9 as the next digit of the answer. 
Result so far: 10159.0
Subtract 756 from 831 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 7:
When dividing 750 by 84, we get 8 with a remainder of 78.
Put 8 as the next digit of the answer. 
Result so far: 10159.8
The remainder is 78 after subtracting 672 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 8:
84 goes into 780 9 times with a remainder of 24.
Write down 9 as next digit of the result. 
Result so far: 10159.89
If we subtract 756 from 780, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 9:
240 divided by 84 is 2 with a remainder of 72.
Write down 2 as next digit of the result. 
Result so far: 10159.892
Subtract 168 from 240 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 10:
The number 84 fits into 720 8 times, leaving a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 10159.8928
Subtracting 672 from 720 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 11:
The number 84 fits into 480 5 times, leaving a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 10159.89285
Subtract 420 from 480 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 12:
600 divided by 84 is 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 10159.892857
Subtract 588 from 600 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
When dividing 120 by 84, we get 1 with a remainder of 36.
The next digit of our result is 1. 
Result so far: 10159.8928571
The remainder is 36 after subtracting 84 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
If we divide 360 by 84, we get 4 and a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 10159.89285714
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 10159.89285714, with a leftover of 2.4e-08.