We look at the division of 664610 by 84 
The aim is to understand the frequency of 84 in 664610.

On to step 1:
When dividing 6 by 84, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 84

Let's proceed to step 2:
If we divide 66 by 84, we get 0 and a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 84

On to step 3:
84 can be fit into 664 7 times, resulting in a remainder of 76.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 76 after subtracting 588 from 664.
Include the next digit (6) from the dividend after 76, then repeat: 766 / 84

Going ahead to step 4:
If we divide 766 by 84, we get 9 and a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 79.0
Subtract 756 from 766 to get 10.
Take the next digit (1) from the dividend and append it to 10, then repeat: 101 / 84

On to step 5:
When dividing 101 by 84, we get 1 with a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 791.0
Subtracting 84 from 101 leaves us with 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 84

Step 6:
If we divide 170 by 84, we get 2 and a remainder of 2.
The next digit of our result is 2. 
Result so far: 7912.0
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
If we divide 20 by 84, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 7912.0
If we subtract 0 from 20, 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.

Moving on to step 8:
If we divide 200 by 84, we get 2 and a remainder of 32.
The next digit of our result is 2. 
Result so far: 7912.02
If we subtract 168 from 200, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 9:
If we divide 320 by 84, we get 3 and a remainder of 68.
Record the quotient 3 as the next digit in the result. 
Result so far: 7912.023
Subtracting 252 from 320 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 10:
If we divide 680 by 84, we get 8 and a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 7912.0238
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.

Moving on to step 11:
When dividing 80 by 84, we get 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 7912.0238
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 12:
The number 84 fits into 800 9 times, leaving a remainder of 44.
Record the quotient 9 as the next digit in the result. 
Result so far: 7912.023809
If we take 756 away from 800, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 13:
84 goes into 440 5 times with a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 7912.0238095
Subtracting 420 from 440 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
When dividing 200 by 84, we get 2 with a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 7912.02380952
If we subtract 168 from 200, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 7912.02380952 and a remainder of 3.2e-08.