Let's divide 897735 by 90
The aim is to understand the frequency of 90 in 897735.

Going ahead to step 1:
90 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 90

Let's proceed to step 2:
When dividing 89 by 90, we get 0 with a remainder of 89.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 89 to get 89.
Fetch the next digit (7) from the dividend, attach it to 89 and continue: 897 / 90

Step 3:
90 can be fit into 897 9 times, resulting in a remainder of 87.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 810 from 897 to get 87.
Bring next digit (7) of the dividend behind the 87 and repeat the process: 877 / 90

On to step 4:
If we divide 877 by 90, we get 9 and a remainder of 67.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
Deduct 810 from 877 and we're left with 67.
Bring next digit (3) of the dividend behind the 67 and repeat the process: 673 / 90

Step 5:
The number 90 fits into 673 7 times, leaving a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 997.0
Deduct 630 from 673 and we're left with 43.
Take the next digit (5) from the dividend and append it to 43, then repeat: 435 / 90

On to step 6:
435 divided by 90 is 4 with a remainder of 75.
Put 4 as the next digit of the answer. 
Result so far: 9974.0
Subtract 360 from 435 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 7:
The number 90 fits into 750 8 times, leaving a remainder of 30.
Use 8 as the next digit of our solution. 
Result so far: 9974.8
The remainder is 30 after subtracting 720 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
If we divide 300 by 90, we get 3 and a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 9974.83
Subtracting 270 from 300 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 9974.833
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 9974.833 with a remainder of 0.003.