We divide 781269 by 90
The aim is to understand the frequency of 90 in 781269.

On to step 1:
The number 90 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 90

On to step 2:
When dividing 78 by 90, we get 0 with a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Take the next digit (1) from the dividend and append it to 78, then repeat: 781 / 90

On to step 3:
When dividing 781 by 90, we get 8 with a remainder of 61.
The next digit of our result is 8. 
Result so far: 8.0
If we take 720 away from 781, we end up with 61.
Fetch the next digit (2) from the dividend, attach it to 61 and continue: 612 / 90

Let's proceed to step 4:
If we divide 612 by 90, we get 6 and a remainder of 72.
Use 6 as the next digit of our solution. 
Result so far: 86.0
If we take 540 away from 612, we end up with 72.
Include the next digit (6) from the dividend after 72, then repeat: 726 / 90

Step 5:
726 divided by 90 is 8 with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 868.0
If we subtract 720 from 726, we get 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 90

Moving on to step 6:
If we divide 69 by 90, we get 0 and a remainder of 69.
Use 0 as the next digit of our solution. 
Result so far: 8680.0
If we take 0 away from 69, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 7:
When dividing 690 by 90, we get 7 with a remainder of 60.
The number 7 becomes the next digit in our result. 
Result so far: 8680.7
Deduct 630 from 690 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 8:
90 goes into 600 6 times with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 8680.76
Deduct 540 from 600 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 8680.766
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 8680.766, with a leftover of 0.006.