We're dividing 659985 by 4 
The aim is to understand the frequency of 4 in 659985.

Going ahead to step 1:
The number 4 fits into 6 1 times, leaving a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 2 after subtracting 4 from 6.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 4

Advancing to step 2:
25 divided by 4 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 24 from 25 to get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 4

On to step 3:
When dividing 19 by 4, we get 4 with a remainder of 3.
The next digit of our result is 4. 
Result so far: 164.0
The remainder is 3 after subtracting 16 from 19.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 4

Advancing to step 4:
39 divided by 4 is 9 with a remainder of 3.
The next digit of our result is 9. 
Result so far: 1649.0
Deduct 36 from 39 and we're left with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 4

On to step 5:
When dividing 38 by 4, we get 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 16499.0
If we subtract 36 from 38, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 4

Let's proceed to step 6:
25 divided by 4 is 6 with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 164996.0
Subtract 24 from 25 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
4 can be fit into 10 2 times, resulting in a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 164996.2
The remainder is 2 after subtracting 8 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
If we divide 20 by 4, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 164996.25
If we take 20 away from 20, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 164996.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
4 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 164996.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 164996.25 with a remainder of 0.0.