We look at the division of 237966 by 84 
The aim is to understand the frequency of 84 in 237966.

Step 1:
When dividing 2 by 84, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 84

Step 2:
84 can be fit into 23 0 times, resulting in a remainder of 23.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 23, we end up with 23.
Append the next digit (7) from the dividend to 23 and continue with: 237 / 84

Advancing to step 3:
237 divided by 84 is 2 with a remainder of 69.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 168 from 237 leaves us with 69.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 84

Going ahead to step 4:
84 can be fit into 699 8 times, resulting in a remainder of 27.
The number 8 becomes the next digit in our result. 
Result so far: 28.0
Subtracting 672 from 699 leaves us with 27.
Include the next digit (6) from the dividend after 27, then repeat: 276 / 84

Step 5:
276 divided by 84 is 3 with a remainder of 24.
Put 3 as the next digit of the answer. 
Result so far: 283.0
If we take 252 away from 276, we end up with 24.
Take the next digit (6) from the dividend and append it to 24, then repeat: 246 / 84

Advancing to step 6:
The number 84 fits into 246 2 times, leaving a remainder of 78.
The next digit of our result is 2. 
Result so far: 2832.0
If we take 168 away from 246, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 7:
If we divide 780 by 84, we get 9 and a remainder of 24.
The next digit of our result is 9. 
Result so far: 2832.9
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.

Moving on to step 8:
When dividing 240 by 84, we get 2 with a remainder of 72.
Write down 2 as next digit of the result. 
Result so far: 2832.92
Deduct 168 from 240 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 9:
When dividing 720 by 84, we get 8 with a remainder of 48.
Write down 8 as next digit of the result. 
Result so far: 2832.928
Subtract 672 from 720 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 10:
84 can be fit into 480 5 times, resulting in a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 2832.9285
If we subtract 420 from 480, we 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.

On to step 11:
600 divided by 84 is 7 with a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 2832.92857
The remainder is 12 after subtracting 588 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 12:
84 goes into 120 1 times with a remainder of 36.
The next digit of our result is 1. 
Result so far: 2832.928571
If we take 84 away from 120, we end up 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.

Step 13:
The number 84 fits into 360 4 times, leaving a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 2832.9285714
If we subtract 336 from 360, 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.

Moving on to step 14:
84 can be fit into 240 2 times, resulting in a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 2832.92857142
Deduct 168 from 240 and we're left with 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 2832.92857142, with a leftover of 7.2e-08.