521253 ÷ 84 
The aim is to understand the frequency of 84 in 521253.

Going ahead to step 1:
84 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 84

Step 2:
52 divided by 84 is 0 with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 52, we end up with 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 84

Step 3:
84 goes into 521 6 times with a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 17 after subtracting 504 from 521.
Grab the next digit (2) from the dividend, add it to 17, then carry on: 172 / 84

Let's proceed to step 4:
The number 84 fits into 172 2 times, leaving a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 62.0
If we subtract 168 from 172, we get 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 84

Going ahead to step 5:
45 divided by 84 is 0 with a remainder of 45.
The number 0 becomes the next digit in our result. 
Result so far: 620.0
Subtract 0 from 45 to get 45.
Fetch the next digit (3) from the dividend, attach it to 45 and continue: 453 / 84

Step 6:
84 can be fit into 453 5 times, resulting in a remainder of 33.
Put 5 as the next digit of the answer. 
Result so far: 6205.0
If we take 420 away from 453, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
The number 84 fits into 330 3 times, leaving a remainder of 78.
Write down 3 as next digit of the result. 
Result so far: 6205.3
If we take 252 away from 330, 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.

Moving on to step 8:
84 can be fit into 780 9 times, resulting in a remainder of 24.
Use 9 as the next digit of our solution. 
Result so far: 6205.39
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 9:
If we divide 240 by 84, we get 2 and a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 6205.392
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 10:
The number 84 fits into 720 8 times, leaving a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 6205.3928
If we subtract 672 from 720, we 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.

Advancing to step 11:
If we divide 480 by 84, we get 5 and a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 6205.39285
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.

Step 12:
The number 84 fits into 600 7 times, leaving a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 6205.392857
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.

Step 13:
The number 84 fits into 120 1 times, leaving a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 6205.3928571
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.

Step 14:
The number 84 fits into 360 4 times, leaving a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 6205.39285714
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.

The final result is 6205.39285714 with a remainder of 2.4e-08.