We look at the division of 964696 by 90 
The aim is to understand the frequency of 90 in 964696.

Advancing to step 1:
9 divided by 90 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 90

Moving on to step 2:
90 can be fit into 96 1 times, resulting in a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 90 from 96, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 90

Step 3:
The number 90 fits into 64 0 times, leaving a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 64 after subtracting 0 from 64.
Include the next digit (6) from the dividend after 64, then repeat: 646 / 90

Step 4:
90 can be fit into 646 7 times, resulting in a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 107.0
If we subtract 630 from 646, we get 16.
Include the next digit (9) from the dividend after 16, then repeat: 169 / 90

On to step 5:
When dividing 169 by 90, we get 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 1071.0
Deduct 90 from 169 and we're left with 79.
Append the next digit (6) from the dividend to 79 and continue with: 796 / 90

Moving on to step 6:
When dividing 796 by 90, we get 8 with a remainder of 76.
Record the quotient 8 as the next digit in the result. 
Result so far: 10718.0
Subtracting 720 from 796 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 7:
90 goes into 760 8 times with a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 10718.8
The remainder is 40 after subtracting 720 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 10718.84
Subtracting 360 from 400 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.

Going ahead to step 9:
90 can be fit into 400 4 times, resulting in a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 10718.844
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The quotient of the division is 10718.844, and the remainder is 0.004.