We look at the division of 685987 by 4 
The aim is to understand the frequency of 4 in 685987.

Let's proceed to step 1:
The number 4 fits into 6 1 times, leaving a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 4

Step 2:
The number 4 fits into 28 7 times, leaving a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we take 28 away from 28, we end up with 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 4

Moving on to step 3:
If we divide 5 by 4, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 171.0
Subtracting 4 from 5 leaves us with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 4

Going ahead to step 4:
4 can be fit into 19 4 times, resulting in a remainder of 3.
The next digit of our result is 4. 
Result so far: 1714.0
The remainder is 3 after subtracting 16 from 19.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 4

Advancing to step 5:
38 divided by 4 is 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 17149.0
Subtracting 36 from 38 leaves us with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 4

Let's proceed to step 6:
When dividing 27 by 4, we get 6 with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 171496.0
Subtract 24 from 27 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
4 goes into 30 7 times with a remainder of 2.
The next digit of our result is 7. 
Result so far: 171496.7
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
20 divided by 4 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 171496.75
Subtract 20 from 20 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.

Step 9:
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: 171496.75
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.

Advancing to step 10:
When dividing 0 by 4, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 171496.75
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 result is 171496.75 with a remainder of 0.0.