We're dividing 257586 by 84 
The aim is to understand the frequency of 84 in 257586.

Going ahead to step 1:
The number 84 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 84

Advancing to step 2:
If we divide 25 by 84, we get 0 and a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Bring next digit (7) of the dividend behind the 25 and repeat the process: 257 / 84

Let's proceed to step 3:
When dividing 257 by 84, we get 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 252 away from 257, we end up with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 84

Going ahead to step 4:
When dividing 55 by 84, we get 0 with a remainder of 55.
Put 0 as the next digit of the answer. 
Result so far: 30.0
If we take 0 away from 55, we end up with 55.
Take the next digit (8) from the dividend and append it to 55, then repeat: 558 / 84

Advancing to step 5:
84 goes into 558 6 times with a remainder of 54.
Put 6 as the next digit of the answer. 
Result so far: 306.0
The remainder is 54 after subtracting 504 from 558.
Fetch the next digit (6) from the dividend, attach it to 54 and continue: 546 / 84

Advancing to step 6:
If we divide 546 by 84, we get 6 and a remainder of 42.
The number 6 becomes the next digit in our result. 
Result so far: 3066.0
Subtract 504 from 546 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 7:
When dividing 420 by 84, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 3066.5
Subtract 420 from 420 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
0 divided by 84 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3066.5
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
0 divided by 84 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3066.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 3066.5 with a remainder of 0.0.