We're dividing 90135515 by 10 
The aim is to understand the frequency of 10 in 90135515.

Going ahead to step 1:
10 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 10

On to step 2:
10 can be fit into 90 9 times, resulting in a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 90 from 90 leaves us with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 10

Advancing to step 3:
1 divided by 10 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 90.0
If we take 0 away from 1, we end up with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 10

Step 4:
10 goes into 13 1 times with a remainder of 3.
The next digit of our result is 1. 
Result so far: 901.0
If we take 10 away from 13, we end up with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 10

Moving on to step 5:
35 divided by 10 is 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 9013.0
Deduct 30 from 35 and we're left with 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 10

Step 6:
If we divide 55 by 10, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 90135.0
Subtracting 50 from 55 leaves us with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 10

Step 7:
The number 10 fits into 51 5 times, leaving a remainder of 1.
The next digit of our result is 5. 
Result so far: 901355.0
Subtracting 50 from 51 leaves us with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 10

Going ahead to step 8:
15 divided by 10 is 1 with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 9013551.0
The remainder is 5 after subtracting 10 from 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
The number 10 fits into 50 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 9013551.5
Deduct 50 from 50 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 10:
When dividing 0 by 10, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9013551.5
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.

Going ahead to step 11:
10 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 9013551.5
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.

After the division, we end up with 9013551.5 and a remainder of 0.0.