Let's divide 781882 by 90
The aim is to understand the frequency of 90 in 781882.

Going ahead to step 1:
90 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 90

Moving on to step 2:
90 can be fit into 78 0 times, resulting in a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Grab the next digit (1) from the dividend, add it to 78, then carry on: 781 / 90

Advancing to step 3:
The number 90 fits into 781 8 times, leaving a remainder of 61.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 61 after subtracting 720 from 781.
Take the next digit (8) from the dividend and append it to 61, then repeat: 618 / 90

Step 4:
The number 90 fits into 618 6 times, leaving a remainder of 78.
Use 6 as the next digit of our solution. 
Result so far: 86.0
Subtract 540 from 618 to get 78.
Include the next digit (8) from the dividend after 78, then repeat: 788 / 90

Step 5:
90 goes into 788 8 times with a remainder of 68.
Record the quotient 8 as the next digit in the result. 
Result so far: 868.0
Subtracting 720 from 788 leaves us with 68.
Fetch the next digit (2) from the dividend, attach it to 68 and continue: 682 / 90

Moving on to step 6:
90 goes into 682 7 times with a remainder of 52.
The next digit of our result is 7. 
Result so far: 8687.0
Subtracting 630 from 682 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 7:
90 can be fit into 520 5 times, resulting in a remainder of 70.
The number 5 becomes the next digit in our result. 
Result so far: 8687.5
Deduct 450 from 520 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 8:
90 can be fit into 700 7 times, resulting in a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 8687.57
Subtracting 630 from 700 leaves us 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.

On to step 9:
When dividing 700 by 90, we get 7 with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 8687.577
Deduct 630 from 700 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.

The final outcome is 8687.577, with a leftover of 0.007.