We're dividing 819874 by 90 
The aim is to understand the frequency of 90 in 819874.

Moving on to step 1:
90 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 90

Let's proceed 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
If we subtract 0 from 81, we get 81.
Bring next digit (9) of the dividend behind the 81 and repeat the process: 819 / 90

Moving on to step 3:
90 goes into 819 9 times with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 810 away from 819, we end up with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 90

Advancing to step 4:
If we divide 98 by 90, we get 1 and a remainder of 8.
The next digit of our result is 1. 
Result so far: 91.0
The remainder is 8 after subtracting 90 from 98.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 90

Going ahead to step 5:
90 can be fit into 87 0 times, resulting in a remainder of 87.
The number 0 becomes the next digit in our result. 
Result so far: 910.0
The remainder is 87 after subtracting 0 from 87.
Fetch the next digit (4) from the dividend, attach it to 87 and continue: 874 / 90

Going ahead to step 6:
When dividing 874 by 90, we get 9 with a remainder of 64.
Write down 9 as next digit of the result. 
Result so far: 9109.0
Subtract 810 from 874 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 7:
The number 90 fits into 640 7 times, leaving a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 9109.7
If we take 630 away from 640, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
100 divided by 90 is 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 9109.71
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
If we divide 100 by 90, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 9109.711
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 9109.711 with a remaining 0.001.