Let's divide 869879 by 53
The aim is to understand the frequency of 53 in 869879.

Moving on to step 1:
When dividing 8 by 53, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 53

Going ahead to step 2:
If we divide 86 by 53, we get 1 and a remainder of 33.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 33 after subtracting 53 from 86.
Grab the next digit (9) from the dividend, add it to 33, then carry on: 339 / 53

Going ahead to step 3:
53 goes into 339 6 times with a remainder of 21.
The next digit of our result is 6. 
Result so far: 16.0
Deduct 318 from 339 and we're left with 21.
Fetch the next digit (8) from the dividend, attach it to 21 and continue: 218 / 53

Moving on to step 4:
53 can be fit into 218 4 times, resulting in a remainder of 6.
The next digit of our result is 4. 
Result so far: 164.0
Subtract 212 from 218 to get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 53

On to step 5:
The number 53 fits into 67 1 times, leaving a remainder of 14.
The next digit of our result is 1. 
Result so far: 1641.0
The remainder is 14 after subtracting 53 from 67.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 53

On to step 6:
The number 53 fits into 149 2 times, leaving a remainder of 43.
The next digit of our result is 2. 
Result so far: 16412.0
Deduct 106 from 149 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 7:
If we divide 430 by 53, we get 8 and a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 16412.8
Subtract 424 from 430 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
53 can be fit into 60 1 times, resulting in a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 16412.81
If we take 53 away from 60, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 9:
53 can be fit into 70 1 times, resulting in a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 16412.811
If we subtract 53 from 70, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 16412.811, with a leftover of 0.0017.