664850 divided by 84 
The aim is to understand the frequency of 84 in 664850.

On to step 1:
If we divide 6 by 84, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 84

Let's proceed to step 2:
66 divided by 84 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (4) from the dividend, add it to 66, then carry on: 664 / 84

Advancing to step 3:
664 divided by 84 is 7 with a remainder of 76.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 588 from 664 to get 76.
Include the next digit (8) from the dividend after 76, then repeat: 768 / 84

Moving on to step 4:
84 can be fit into 768 9 times, resulting in a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 79.0
Deduct 756 from 768 and we're left with 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 84

Advancing to step 5:
If we divide 125 by 84, we get 1 and a remainder of 41.
The number 1 becomes the next digit in our result. 
Result so far: 791.0
The remainder is 41 after subtracting 84 from 125.
Grab the next digit (0) from the dividend, add it to 41, then carry on: 410 / 84

Advancing to step 6:
410 divided by 84 is 4 with a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 7914.0
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.

Moving on to step 7:
If we divide 740 by 84, we get 8 and a remainder of 68.
The number 8 becomes the next digit in our result. 
Result so far: 7914.8
Subtract 672 from 740 to 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.

Advancing to step 8:
The number 84 fits into 680 8 times, leaving a remainder of 8.
The next digit of our result is 8. 
Result so far: 7914.88
Subtracting 672 from 680 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 7914.88 with a remainder of 0.008.