We look at the division of 643922 by 2 
The aim is to understand the frequency of 2 in 643922.

Advancing to step 1:
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: 3.0
Deduct 6 from 6 and we're left with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 2

On to step 2:
The number 2 fits into 4 2 times, leaving a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 32.0
If we subtract 4 from 4, we get 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 2

Let's proceed to step 3:
When dividing 3 by 2, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 321.0
Subtract 2 from 3 to get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 2

Step 4:
The number 2 fits into 19 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 3219.0
The remainder is 1 after subtracting 18 from 19.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 2

Let's proceed to step 5:
When dividing 12 by 2, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 32196.0
If we subtract 12 from 12, we get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 2

Advancing to step 6:
2 goes into 2 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 321961.0
The remainder is 0 after subtracting 2 from 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
2 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 321961.0
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.

Moving on to step 8:
The number 2 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 321961.0
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.

Our division results in 321961.0 with a remaining 0.0.