We look at the division of 648369 by 84 
The aim is to understand the frequency of 84 in 648369.

Going ahead to step 1:
If we divide 6 by 84, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 84

Advancing to step 2:
The number 84 fits into 64 0 times, leaving a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Bring next digit (8) of the dividend behind the 64 and repeat the process: 648 / 84

Step 3:
84 can be fit into 648 7 times, resulting in a remainder of 60.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 588 from 648, we get 60.
Take the next digit (3) from the dividend and append it to 60, then repeat: 603 / 84

On to step 4:
84 can be fit into 603 7 times, resulting in a remainder of 15.
The next digit of our result is 7. 
Result so far: 77.0
Subtracting 588 from 603 leaves us with 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 84

Moving on to step 5:
When dividing 156 by 84, we get 1 with a remainder of 72.
Write down 1 as next digit of the result. 
Result so far: 771.0
The remainder is 72 after subtracting 84 from 156.
Append the next digit (9) from the dividend to 72 and continue with: 729 / 84

On to step 6:
When dividing 729 by 84, we get 8 with a remainder of 57.
Put 8 as the next digit of the answer. 
Result so far: 7718.0
If we take 672 away from 729, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 7:
84 goes into 570 6 times with a remainder of 66.
The next digit of our result is 6. 
Result so far: 7718.6
Subtract 504 from 570 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 8:
When dividing 660 by 84, we get 7 with a remainder of 72.
The next digit of our result is 7. 
Result so far: 7718.67
Subtract 588 from 660 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 9:
84 goes into 720 8 times with a remainder of 48.
The next digit of our result is 8. 
Result so far: 7718.678
If we take 672 away from 720, we end up 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.

Let's proceed to step 10:
480 divided by 84 is 5 with a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 7718.6785
The remainder is 60 after subtracting 420 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 11:
When dividing 600 by 84, we get 7 with a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 7718.67857
Subtracting 588 from 600 leaves us 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 12:
84 goes into 120 1 times with a remainder of 36.
The number 1 becomes the next digit in our result. 
Result so far: 7718.678571
Subtracting 84 from 120 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
The number 84 fits into 360 4 times, leaving a remainder of 24.
Put 4 as the next digit of the answer. 
Result so far: 7718.6785714
If we take 336 away from 360, we end up 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.

Let's proceed to step 14:
The number 84 fits into 240 2 times, leaving a remainder of 72.
Record the quotient 2 as the next digit in the result. 
Result so far: 7718.67857142
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.

The final outcome is 7718.67857142, with a leftover of 7.2e-08.