We look at the division of 243128 by 84 
The aim is to understand the frequency of 84 in 243128.

On to step 1:
When dividing 2 by 84, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 84

On to step 2:
24 divided by 84 is 0 with a remainder of 24.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 24 leaves us with 24.
Bring next digit (3) of the dividend behind the 24 and repeat the process: 243 / 84

Step 3:
The number 84 fits into 243 2 times, leaving a remainder of 75.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 168 from 243, we get 75.
Take the next digit (1) from the dividend and append it to 75, then repeat: 751 / 84

Step 4:
751 divided by 84 is 8 with a remainder of 79.
The next digit of our result is 8. 
Result so far: 28.0
Subtracting 672 from 751 leaves us with 79.
Include the next digit (2) from the dividend after 79, then repeat: 792 / 84

Going ahead to step 5:
The number 84 fits into 792 9 times, leaving a remainder of 36.
The next digit of our result is 9. 
Result so far: 289.0
Subtracting 756 from 792 leaves us with 36.
Bring next digit (8) of the dividend behind the 36 and repeat the process: 368 / 84

Let's proceed to step 6:
If we divide 368 by 84, we get 4 and a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 2894.0
If we take 336 away from 368, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 7:
The number 84 fits into 320 3 times, leaving a remainder of 68.
The next digit of our result is 3. 
Result so far: 2894.3
If we subtract 252 from 320, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 8:
84 goes into 680 8 times with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 2894.38
Subtract 672 from 680 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
When dividing 80 by 84, we get 0 with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 2894.38
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 10:
When dividing 800 by 84, we get 9 with a remainder of 44.
The number 9 becomes the next digit in our result. 
Result so far: 2894.3809
Subtract 756 from 800 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 11:
84 can be fit into 440 5 times, resulting in a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 2894.38095
The remainder is 20 after subtracting 420 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
84 can be fit into 200 2 times, resulting in a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 2894.380952
If we take 168 away from 200, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 13:
84 goes into 320 3 times with a remainder of 68.
The next digit of our result is 3. 
Result so far: 2894.3809523
The remainder is 68 after subtracting 252 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 14:
680 divided by 84 is 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 2894.38095238
The remainder is 8 after subtracting 672 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 2894.38095238 and a remainder of 8e-09.