85219193 ÷ 90 
The aim is to understand the frequency of 90 in 85219193.

Let's proceed to step 1:
90 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 90

Going ahead to step 2:
The number 90 fits into 85 0 times, leaving a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 85, we end up with 85.
Take the next digit (2) from the dividend and append it to 85, then repeat: 852 / 90

On to step 3:
When dividing 852 by 90, we get 9 with a remainder of 42.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 810 from 852, we get 42.
Bring next digit (1) of the dividend behind the 42 and repeat the process: 421 / 90

On to step 4:
If we divide 421 by 90, we get 4 and a remainder of 61.
Put 4 as the next digit of the answer. 
Result so far: 94.0
Deduct 360 from 421 and we're left with 61.
Fetch the next digit (9) from the dividend, attach it to 61 and continue: 619 / 90

Moving on to step 5:
If we divide 619 by 90, we get 6 and a remainder of 79.
Record the quotient 6 as the next digit in the result. 
Result so far: 946.0
Subtracting 540 from 619 leaves us with 79.
Include the next digit (1) from the dividend after 79, then repeat: 791 / 90

Advancing to step 6:
If we divide 791 by 90, we get 8 and a remainder of 71.
Put 8 as the next digit of the answer. 
Result so far: 9468.0
Subtracting 720 from 791 leaves us with 71.
Append the next digit (9) from the dividend to 71 and continue with: 719 / 90

Moving on to step 7:
719 divided by 90 is 7 with a remainder of 89.
The number 7 becomes the next digit in our result. 
Result so far: 94687.0
The remainder is 89 after subtracting 630 from 719.
Bring next digit (3) of the dividend behind the 89 and repeat the process: 893 / 90

Moving on to step 8:
90 goes into 893 9 times with a remainder of 83.
The number 9 becomes the next digit in our result. 
Result so far: 946879.0
If we subtract 810 from 893, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Advancing to step 9:
90 goes into 830 9 times with a remainder of 20.
Write down 9 as next digit of the result. 
Result so far: 946879.9
The remainder is 20 after subtracting 810 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 946879.92
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
If we divide 200 by 90, we get 2 and a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 946879.922
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 946879.922, and the remainder is 0.002.