We look at the division of 901015 by 5 
The aim is to understand the frequency of 5 in 901015.

Step 1:
The number 5 fits into 9 1 times, leaving a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 5 from 9 leaves us with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 5

On to step 2:
If we divide 40 by 5, we get 8 and a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Subtracting 40 from 40 leaves us with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 5

Step 3:
1 divided by 5 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 180.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 5

Let's proceed to step 4:
5 goes into 10 2 times with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 1802.0
The remainder is 0 after subtracting 10 from 10.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 5

Moving on to step 5:
When dividing 1 by 5, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 18020.0
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 5

On to step 6:
5 goes into 15 3 times with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 180203.0
If we subtract 15 from 15, we 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.

Let's proceed to step 7:
0 divided by 5 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 180203.0
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:
0 divided by 5 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 180203.0
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 result is 180203.0 with a remainder of 0.0.