686999 divided by 5 
The aim is to understand the frequency of 5 in 686999.

On to step 1:
6 divided by 5 is 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 5 from 6, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 5

Moving on to step 2:
5 goes into 18 3 times with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 13.0
The remainder is 3 after subtracting 15 from 18.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 5

Moving on to step 3:
5 can be fit into 36 7 times, resulting in a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 137.0
If we take 35 away from 36, we end up with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 5

Advancing to step 4:
5 can be fit into 19 3 times, resulting in a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 1373.0
The remainder is 4 after subtracting 15 from 19.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 5

Moving on to step 5:
The number 5 fits into 49 9 times, leaving a remainder of 4.
The next digit of our result is 9. 
Result so far: 13739.0
Subtracting 45 from 49 leaves us with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 5

Step 6:
When dividing 49 by 5, we get 9 with a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 137399.0
If we subtract 45 from 49, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
When dividing 40 by 5, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 137399.8
Deduct 40 from 40 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.

Let's proceed to step 8:
The number 5 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 137399.8
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.

Advancing to step 9:
The number 5 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 137399.8
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 final outcome is 137399.8, with a leftover of 0.0.