Let's divide 781033 by 90
The aim is to understand the frequency of 90 in 781033.

Moving on to step 1:
When dividing 7 by 90, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 90

On to step 2:
78 divided by 90 is 0 with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (1) from the dividend to 78 and continue with: 781 / 90

Going ahead to step 3:
781 divided by 90 is 8 with a remainder of 61.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we take 720 away from 781, we end up with 61.
Fetch the next digit (0) from the dividend, attach it to 61 and continue: 610 / 90

Step 4:
When dividing 610 by 90, we get 6 with a remainder of 70.
The next digit of our result is 6. 
Result so far: 86.0
If we subtract 540 from 610, we get 70.
Bring next digit (3) of the dividend behind the 70 and repeat the process: 703 / 90

Moving on to step 5:
The number 90 fits into 703 7 times, leaving a remainder of 73.
Record the quotient 7 as the next digit in the result. 
Result so far: 867.0
If we take 630 away from 703, we end up with 73.
Take the next digit (3) from the dividend and append it to 73, then repeat: 733 / 90

Going ahead to step 6:
90 goes into 733 8 times with a remainder of 13.
The next digit of our result is 8. 
Result so far: 8678.0
Subtracting 720 from 733 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
130 divided by 90 is 1 with a remainder of 40.
The next digit of our result is 1. 
Result so far: 8678.1
Subtracting 90 from 130 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 8:
When dividing 400 by 90, we get 4 with a remainder of 40.
The next digit of our result is 4. 
Result so far: 8678.14
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
90 goes into 400 4 times with a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 8678.144
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 8678.144 and a remainder of 0.004.