We're dividing 302259 by 85 
The aim is to understand the frequency of 85 in 302259.

Step 1:
If we divide 3 by 85, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 85

Let's proceed to step 2:
If we divide 30 by 85, we get 0 and a remainder of 30.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Grab the next digit (2) from the dividend, add it to 30, then carry on: 302 / 85

Advancing to step 3:
85 goes into 302 3 times with a remainder of 47.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 255 from 302 and we're left with 47.
Include the next digit (2) from the dividend after 47, then repeat: 472 / 85

Going ahead to step 4:
472 divided by 85 is 5 with a remainder of 47.
The next digit of our result is 5. 
Result so far: 35.0
Subtract 425 from 472 to get 47.
Grab the next digit (5) from the dividend, add it to 47, then carry on: 475 / 85

On to step 5:
The number 85 fits into 475 5 times, leaving a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 355.0
The remainder is 50 after subtracting 425 from 475.
Fetch the next digit (9) from the dividend, attach it to 50 and continue: 509 / 85

On to step 6:
If we divide 509 by 85, we get 5 and a remainder of 84.
Put 5 as the next digit of the answer. 
Result so far: 3555.0
If we subtract 425 from 509, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Going ahead to step 7:
85 can be fit into 840 9 times, resulting in a remainder of 75.
Put 9 as the next digit of the answer. 
Result so far: 3555.9
Subtract 765 from 840 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 8:
When dividing 750 by 85, we get 8 with a remainder of 70.
Use 8 as the next digit of our solution. 
Result so far: 3555.98
The remainder is 70 after subtracting 680 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
When dividing 700 by 85, we get 8 with a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 3555.988
If we subtract 680 from 700, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 3555.988, and the remainder is 0.002.