We divide 21336 by 4
The aim is to understand the frequency of 4 in 21336.

On to step 1:
When dividing 2 by 4, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 4

On to step 2:
The number 4 fits into 21 5 times, leaving a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 20 from 21 and we're left with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 4

Advancing to step 3:
The number 4 fits into 13 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
Subtracting 12 from 13 leaves us with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 4

Let's proceed to step 4:
The number 4 fits into 13 3 times, leaving a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 533.0
If we take 12 away from 13, we end up with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 4

Going ahead to step 5:
The number 4 fits into 16 4 times, leaving a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 5334.0
Subtracting 16 from 16 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.

Going ahead to step 6:
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: 5334.0
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.

Advancing to step 7:
0 divided by 4 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5334.0
Deduct 0 from 0 and we're left 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.

After the division, we end up with 5334.0 and a remainder of 0.0.