721172 divided by 5 
The aim is to understand the frequency of 5 in 721172.

On to step 1:
If we divide 7 by 5, we get 1 and a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 5 away from 7, we end up with 2.
Append the next digit (2) from the dividend to 2 and continue with: 22 / 5

On to step 2:
If we divide 22 by 5, we get 4 and a remainder of 2.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 20 from 22 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 5

Step 3:
When dividing 21 by 5, we get 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 144.0
Subtracting 20 from 21 leaves us with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 5

Moving on to step 4:
When dividing 11 by 5, we get 2 with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 1442.0
Subtract 10 from 11 to get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 5

On to step 5:
The number 5 fits into 17 3 times, leaving a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 14423.0
Subtracting 15 from 17 leaves us with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 5

Let's proceed to step 6:
If we divide 22 by 5, we get 4 and a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 144234.0
The remainder is 2 after subtracting 20 from 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
5 can be fit into 20 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 144234.4
Subtracting 20 from 20 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.

Let's proceed to step 8:
When dividing 0 by 5, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 144234.4
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.

Moving on to step 9:
If we divide 0 by 5, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 144234.4
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.

The final outcome is 144234.4, with a leftover of 0.0.