We divide 81012596 by 90
The aim is to understand the frequency of 90 in 81012596.

Moving on to step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 90

Moving on to step 2:
If we divide 81 by 90, we get 0 and a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Take the next digit (0) from the dividend and append it to 81, then repeat: 810 / 90

Advancing to step 3:
90 goes into 810 9 times with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 810 from 810 to get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 90

Moving on to step 4:
The number 90 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 90.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 90

Let's proceed to step 5:
90 goes into 12 0 times with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 900.0
The remainder is 12 after subtracting 0 from 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 90

Let's proceed to step 6:
90 can be fit into 125 1 times, resulting in a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 9001.0
If we take 90 away from 125, we end up with 35.
Append the next digit (9) from the dividend to 35 and continue with: 359 / 90

Moving on to step 7:
The number 90 fits into 359 3 times, leaving a remainder of 89.
Use 3 as the next digit of our solution. 
Result so far: 90013.0
The remainder is 89 after subtracting 270 from 359.
Append the next digit (6) from the dividend to 89 and continue with: 896 / 90

Moving on to step 8:
When dividing 896 by 90, we get 9 with a remainder of 86.
Write down 9 as next digit of the result. 
Result so far: 900139.0
Deduct 810 from 896 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Going ahead to step 9:
90 can be fit into 860 9 times, resulting in a remainder of 50.
The next digit of our result is 9. 
Result so far: 900139.9
Subtracting 810 from 860 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 10:
When dividing 500 by 90, we get 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 900139.95
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 11:
The number 90 fits into 500 5 times, leaving a remainder of 50.
The next digit of our result is 5. 
Result so far: 900139.955
If we take 450 away from 500, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The quotient of the division is 900139.955, and the remainder is 0.005.