215688 divided by 4 
The aim is to understand the frequency of 4 in 215688.

Step 1:
When dividing 2 by 4, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 4

Step 2:
21 divided by 4 is 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 20 away from 21, we end up with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 4

Let's proceed to step 3:
15 divided by 4 is 3 with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
If we take 12 away from 15, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 4

Moving on to step 4:
36 divided by 4 is 9 with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 539.0
If we take 36 away from 36, we end up with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 4

Advancing to step 5:
If we divide 8 by 4, we get 2 and a remainder of 0.
The next digit of our result is 2. 
Result so far: 5392.0
Subtract 8 from 8 to get 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 4

Advancing to step 6:
The number 4 fits into 8 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 53922.0
Subtracting 8 from 8 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 7:
If we divide 0 by 4, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 53922.0
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.

Advancing to step 8:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 53922.0
The remainder is 0 after subtracting 0 from 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 quotient of the division is 53922.0, and the remainder is 0.0.