We look at the division of 485645 by 84 
The aim is to understand the frequency of 84 in 485645.

On to step 1:
84 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 84

Step 2:
If we divide 48 by 84, we get 0 and a remainder of 48.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 48 leaves us with 48.
Grab the next digit (5) from the dividend, add it to 48, then carry on: 485 / 84

Advancing to step 3:
485 divided by 84 is 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 420 from 485 to get 65.
Bring next digit (6) of the dividend behind the 65 and repeat the process: 656 / 84

Moving on to step 4:
If we divide 656 by 84, we get 7 and a remainder of 68.
Write down 7 as next digit of the result. 
Result so far: 57.0
If we subtract 588 from 656, we get 68.
Include the next digit (4) from the dividend after 68, then repeat: 684 / 84

Advancing to step 5:
The number 84 fits into 684 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 578.0
If we take 672 away from 684, we end up with 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 84

Moving on to step 6:
84 goes into 125 1 times with a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 5781.0
Subtract 84 from 125 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 7:
When dividing 410 by 84, we get 4 with a remainder of 74.
Record the quotient 4 as the next digit in the result. 
Result so far: 5781.4
If we subtract 336 from 410, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 8:
84 goes into 740 8 times with a remainder of 68.
The number 8 becomes the next digit in our result. 
Result so far: 5781.48
If we subtract 672 from 740, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 9:
When dividing 680 by 84, we get 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 5781.488
The remainder is 8 after subtracting 672 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 5781.488 and a remainder of 0.0008.