891934 ÷ 90 
The aim is to understand the frequency of 90 in 891934.

Step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 90

Let's proceed to step 2:
89 divided by 90 is 0 with a remainder of 89.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 89 leaves us with 89.
Take the next digit (1) from the dividend and append it to 89, then repeat: 891 / 90

Moving on to step 3:
The number 90 fits into 891 9 times, leaving a remainder of 81.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 810 from 891 leaves us with 81.
Grab the next digit (9) from the dividend, add it to 81, then carry on: 819 / 90

Let's proceed to step 4:
90 goes into 819 9 times with a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 99.0
Deduct 810 from 819 and we're left with 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 90

Step 5:
90 can be fit into 93 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 991.0
Deduct 90 from 93 and we're left with 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 90

Let's proceed to step 6:
The number 90 fits into 34 0 times, leaving a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 9910.0
Subtracting 0 from 34 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 7:
90 goes into 340 3 times with a remainder of 70.
Use 3 as the next digit of our solution. 
Result so far: 9910.3
If we take 270 away from 340, we end up 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.

Going ahead to step 8:
90 can be fit into 700 7 times, resulting in a remainder of 70.
The next digit of our result is 7. 
Result so far: 9910.37
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:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 9910.377
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.

In conclusion, the division gives 9910.377 with a balance of 0.007.