85666594 ÷ 900 
The aim is to understand the frequency of 900 in 85666594.

Advancing to step 1:
If we divide 8 by 900, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 900

Advancing to step 2:
900 can be fit into 85 0 times, resulting in 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.
Include the next digit (6) from the dividend after 85, then repeat: 856 / 900

Let's proceed to step 3:
If we divide 856 by 900, we get 0 and a remainder of 856.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 856 to get 856.
Take the next digit (6) from the dividend and append it to 856, then repeat: 8566 / 900

Let's proceed to step 4:
900 can be fit into 8566 9 times, resulting in a remainder of 466.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 8100 from 8566 to get 466.
Include the next digit (6) from the dividend after 466, then repeat: 4666 / 900

Going ahead to step 5:
900 can be fit into 4666 5 times, resulting in a remainder of 166.
The next digit of our result is 5. 
Result so far: 95.0
If we take 4500 away from 4666, we end up with 166.
Take the next digit (5) from the dividend and append it to 166, then repeat: 1665 / 900

Let's proceed to step 6:
The number 900 fits into 1665 1 times, leaving a remainder of 765.
The number 1 becomes the next digit in our result. 
Result so far: 951.0
If we take 900 away from 1665, we end up with 765.
Include the next digit (9) from the dividend after 765, then repeat: 7659 / 900

Advancing to step 7:
900 can be fit into 7659 8 times, resulting in a remainder of 459.
Write down 8 as next digit of the result. 
Result so far: 9518.0
The remainder is 459 after subtracting 7200 from 7659.
Include the next digit (4) from the dividend after 459, then repeat: 4594 / 900

Moving on to step 8:
The number 900 fits into 4594 5 times, leaving a remainder of 94.
Write down 5 as next digit of the result. 
Result so far: 95185.0
Deduct 4500 from 4594 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Moving on to step 9:
When dividing 940 by 900, we get 1 with a remainder of 40.
The next digit of our result is 1. 
Result so far: 95185.1
Subtracting 900 from 940 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.

Step 10:
If we divide 400 by 900, we get 0 and a remainder of 400.
Put 0 as the next digit of the answer. 
Result so far: 95185.1
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 11:
900 goes into 4000 4 times with a remainder of 400.
Put 4 as the next digit of the answer. 
Result so far: 95185.104
The remainder is 400 after subtracting 3600 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 12:
900 goes into 4000 4 times with a remainder of 400.
Write down 4 as next digit of the result. 
Result so far: 95185.1044
Deduct 3600 from 4000 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

The final outcome is 95185.1044, with a leftover of 0.004.