721344 ÷ 84 
The aim is to understand the frequency of 84 in 721344.

Moving on to step 1:
When dividing 7 by 84, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 84

Advancing to step 2:
72 divided by 84 is 0 with a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 72 leaves us with 72.
Fetch the next digit (1) from the dividend, attach it to 72 and continue: 721 / 84

Advancing to step 3:
84 can be fit into 721 8 times, resulting in a remainder of 49.
Write down 8 as next digit of the result. 
Result so far: 8.0
The remainder is 49 after subtracting 672 from 721.
Take the next digit (3) from the dividend and append it to 49, then repeat: 493 / 84

On to step 4:
When dividing 493 by 84, we get 5 with a remainder of 73.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
If we take 420 away from 493, we end up with 73.
Grab the next digit (4) from the dividend, add it to 73, then carry on: 734 / 84

Step 5:
84 can be fit into 734 8 times, resulting in a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 858.0
Deduct 672 from 734 and we're left with 62.
Append the next digit (4) from the dividend to 62 and continue with: 624 / 84

Going ahead to step 6:
84 goes into 624 7 times with a remainder of 36.
Use 7 as the next digit of our solution. 
Result so far: 8587.0
If we take 588 away from 624, 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.

Let's proceed to step 7:
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: 8587.4
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.

Advancing to step 8:
The number 84 fits into 240 2 times, leaving a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 8587.42
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.

Advancing to step 9:
720 divided by 84 is 8 with a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 8587.428
The remainder is 48 after subtracting 672 from 720.
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:
480 divided by 84 is 5 with a remainder of 60.
The next digit of our result is 5. 
Result so far: 8587.4285
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.

Moving on to step 11:
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: 8587.42857
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.

Let's proceed to step 12:
84 goes into 120 1 times with a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 8587.428571
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing 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: 8587.4285714
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.

Moving on to step 14:
84 can be fit into 240 2 times, resulting in a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 8587.42857142
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 result is 8587.42857142 with a remainder of 7.2e-08.