We divide 645619 by 5
The aim is to understand the frequency of 5 in 645619.

Moving on to step 1:
6 divided by 5 is 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 5 from 6 and we're left with 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 5

On to step 2:
14 divided by 5 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 10 from 14, we get 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 5

Let's proceed to step 3:
When dividing 45 by 5, we get 9 with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 129.0
Subtracting 45 from 45 leaves us with 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 5

Moving on to step 4:
The number 5 fits into 6 1 times, leaving a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1291.0
Deduct 5 from 6 and we're left with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 5

Step 5:
The number 5 fits into 11 2 times, leaving a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 12912.0
The remainder is 1 after subtracting 10 from 11.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 5

On to step 6:
19 divided by 5 is 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 129123.0
The remainder is 4 after subtracting 15 from 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
If we divide 40 by 5, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 129123.8
Subtract 40 from 40 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 8:
0 divided by 5 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 129123.8
If we take 0 away from 0, we end up 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 9:
When dividing 0 by 5, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 129123.8
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.

In conclusion, the division gives 129123.8 with a balance of 0.0.