663372 ÷ 4 
The aim is to understand the frequency of 4 in 663372.

Advancing to step 1:
The number 4 fits into 6 1 times, leaving a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 4 from 6 to get 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 4

Going ahead to step 2:
26 divided by 4 is 6 with a remainder of 2.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 24 from 26 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 4

On to step 3:
If we divide 23 by 4, we get 5 and a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 165.0
Subtract 20 from 23 to get 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 4

Let's proceed to step 4:
The number 4 fits into 33 8 times, leaving a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 1658.0
Subtracting 32 from 33 leaves us with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 4

Going ahead to step 5:
17 divided by 4 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 16584.0
Deduct 16 from 17 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 4

Advancing to step 6:
12 divided by 4 is 3 with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 165843.0
Subtract 12 from 12 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.

Moving on to step 7:
4 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 165843.0
Subtracting 0 from 0 leaves us 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.

On to step 8:
0 divided by 4 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 165843.0
Subtracting 0 from 0 leaves us 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.

The final outcome is 165843.0, with a leftover of 0.0.