We look at the division of 168645 by 2 
The aim is to understand the frequency of 2 in 168645.

Advancing to step 1:
If we divide 1 by 2, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 2

Moving on to step 2:
16 divided by 2 is 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 16 from 16, we get 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 2

Advancing to step 3:
2 can be fit into 8 4 times, resulting in a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 84.0
Deduct 8 from 8 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 2

On to step 4:
2 can be fit into 6 3 times, resulting in a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 843.0
If we subtract 6 from 6, we get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 2

Step 5:
2 goes into 4 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 8432.0
The remainder is 0 after subtracting 4 from 4.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 2

Let's proceed to step 6:
2 goes into 5 2 times with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 84322.0
If we subtract 4 from 5, we 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.

Let's proceed to step 7:
If we divide 10 by 2, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 84322.5
Subtract 10 from 10 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 8:
If we divide 0 by 2, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 84322.5
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.

On to step 9:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 84322.5
If we take 0 away from 0, 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.

The final outcome is 84322.5, with a leftover of 0.0.