964415 divided by 90 
The aim is to understand the frequency of 90 in 964415.

Let's proceed to step 1:
The number 90 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 90

Going ahead to step 2:
If we divide 96 by 90, we get 1 and a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 90 from 96 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 90

Advancing to step 3:
64 divided by 90 is 0 with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 64 to get 64.
Take the next digit (4) from the dividend and append it to 64, then repeat: 644 / 90

Moving on to step 4:
The number 90 fits into 644 7 times, leaving a remainder of 14.
The next digit of our result is 7. 
Result so far: 107.0
If we subtract 630 from 644, we get 14.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 90

Advancing to step 5:
When dividing 141 by 90, we get 1 with a remainder of 51.
The number 1 becomes the next digit in our result. 
Result so far: 1071.0
If we subtract 90 from 141, we get 51.
Fetch the next digit (5) from the dividend, attach it to 51 and continue: 515 / 90

Advancing to step 6:
When dividing 515 by 90, we get 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 10715.0
The remainder is 65 after subtracting 450 from 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 7:
90 can be fit into 650 7 times, resulting in a remainder of 20.
The next digit of our result is 7. 
Result so far: 10715.7
Subtracting 630 from 650 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
If we divide 200 by 90, we get 2 and a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 10715.72
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
When dividing 200 by 90, we get 2 with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 10715.722
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 10715.722 with a remaining 0.002.