853693 ÷ 90 
The aim is to understand the frequency of 90 in 853693.

Advancing to step 1:
8 divided by 90 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 90

Let's proceed to step 2:
The number 90 fits into 85 0 times, leaving a remainder of 85.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 85 to get 85.
Append the next digit (3) from the dividend to 85 and continue with: 853 / 90

Let's proceed to step 3:
90 can be fit into 853 9 times, resulting in a remainder of 43.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 810 from 853 to get 43.
Take the next digit (6) from the dividend and append it to 43, then repeat: 436 / 90

Moving on to step 4:
90 goes into 436 4 times with a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 94.0
The remainder is 76 after subtracting 360 from 436.
Include the next digit (9) from the dividend after 76, then repeat: 769 / 90

Moving on to step 5:
769 divided by 90 is 8 with a remainder of 49.
Write down 8 as next digit of the result. 
Result so far: 948.0
Deduct 720 from 769 and we're left with 49.
Take the next digit (3) from the dividend and append it to 49, then repeat: 493 / 90

Going ahead to step 6:
When dividing 493 by 90, we get 5 with a remainder of 43.
Write down 5 as next digit of the result. 
Result so far: 9485.0
The remainder is 43 after subtracting 450 from 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
90 goes into 430 4 times with a remainder of 70.
Use 4 as the next digit of our solution. 
Result so far: 9485.4
Subtracting 360 from 430 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.

Advancing to step 8:
90 goes into 700 7 times with a remainder of 70.
The next digit of our result is 7. 
Result so far: 9485.47
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 9:
90 goes into 700 7 times with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 9485.477
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.

After the division, we end up with 9485.477 and a remainder of 0.007.