We're dividing 661745 by 84 
The aim is to understand the frequency of 84 in 661745.

Moving on to step 1:
6 divided by 84 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 84

Step 2:
84 goes into 66 0 times with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (1) from the dividend, add it to 66, then carry on: 661 / 84

Moving on to step 3:
84 goes into 661 7 times with a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtracting 588 from 661 leaves us with 73.
Include the next digit (7) from the dividend after 73, then repeat: 737 / 84

Moving on to step 4:
84 can be fit into 737 8 times, resulting in a remainder of 65.
Write down 8 as next digit of the result. 
Result so far: 78.0
Subtract 672 from 737 to get 65.
Fetch the next digit (4) from the dividend, attach it to 65 and continue: 654 / 84

Going ahead to step 5:
84 goes into 654 7 times with a remainder of 66.
Write down 7 as next digit of the result. 
Result so far: 787.0
The remainder is 66 after subtracting 588 from 654.
Fetch the next digit (5) from the dividend, attach it to 66 and continue: 665 / 84

On to step 6:
84 can be fit into 665 7 times, resulting in a remainder of 77.
The number 7 becomes the next digit in our result. 
Result so far: 7877.0
If we take 588 away from 665, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Let's proceed to step 7:
84 goes into 770 9 times with a remainder of 14.
Put 9 as the next digit of the answer. 
Result so far: 7877.9
The remainder is 14 after subtracting 756 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
If we divide 140 by 84, we get 1 and a remainder of 56.
Put 1 as the next digit of the answer. 
Result so far: 7877.91
Subtracting 84 from 140 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 9:
When dividing 560 by 84, we get 6 with a remainder of 56.
Write down 6 as next digit of the result. 
Result so far: 7877.916
If we subtract 504 from 560, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 10:
84 can be fit into 560 6 times, resulting in a remainder of 56.
Use 6 as the next digit of our solution. 
Result so far: 7877.9166
Subtract 504 from 560 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final outcome is 7877.9166, with a leftover of 0.00056.