28896793 ÷ 90 
The aim is to understand the frequency of 90 in 28896793.

Step 1:
2 divided by 90 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 90

Let's proceed to step 2:
When dividing 28 by 90, we get 0 with a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 28 leaves us with 28.
Fetch the next digit (8) from the dividend, attach it to 28 and continue: 288 / 90

Moving on to step 3:
90 can be fit into 288 3 times, resulting in a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 270 from 288 to get 18.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 90

Advancing to step 4:
When dividing 189 by 90, we get 2 with a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 32.0
Subtracting 180 from 189 leaves us with 9.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 90

Advancing to step 5:
90 can be fit into 96 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 321.0
If we subtract 90 from 96, we get 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 90

Going ahead to step 6:
67 divided by 90 is 0 with a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 3210.0
Subtracting 0 from 67 leaves us with 67.
Include the next digit (9) from the dividend after 67, then repeat: 679 / 90

Moving on to step 7:
679 divided by 90 is 7 with a remainder of 49.
Put 7 as the next digit of the answer. 
Result so far: 32107.0
If we subtract 630 from 679, we get 49.
Fetch the next digit (3) from the dividend, attach it to 49 and continue: 493 / 90

Moving on to step 8:
The number 90 fits into 493 5 times, leaving a remainder of 43.
Record the quotient 5 as the next digit in the result. 
Result so far: 321075.0
Subtract 450 from 493 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
90 can be fit into 430 4 times, resulting in a remainder of 70.
The number 4 becomes the next digit in our result. 
Result so far: 321075.4
Deduct 360 from 430 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 10:
When dividing 700 by 90, we get 7 with a remainder of 70.
The next digit of our result is 7. 
Result so far: 321075.47
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 11:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 321075.477
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 321075.477, with a leftover of 0.007.