65531658 ÷ 90 
The aim is to understand the frequency of 90 in 65531658.

Moving on to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 90

Advancing to step 2:
90 can be fit into 65 0 times, resulting in a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 65 leaves us with 65.
Take the next digit (5) from the dividend and append it to 65, then repeat: 655 / 90

Advancing to step 3:
When dividing 655 by 90, we get 7 with a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 630 from 655, we get 25.
Take the next digit (3) from the dividend and append it to 25, then repeat: 253 / 90

Moving on to step 4:
If we divide 253 by 90, we get 2 and a remainder of 73.
The number 2 becomes the next digit in our result. 
Result so far: 72.0
The remainder is 73 after subtracting 180 from 253.
Take the next digit (1) from the dividend and append it to 73, then repeat: 731 / 90

Let's proceed to step 5:
90 goes into 731 8 times with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 728.0
If we take 720 away from 731, we end up with 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 90

Let's proceed to step 6:
The number 90 fits into 116 1 times, leaving a remainder of 26.
Use 1 as the next digit of our solution. 
Result so far: 7281.0
If we subtract 90 from 116, we get 26.
Fetch the next digit (5) from the dividend, attach it to 26 and continue: 265 / 90

Moving on to step 7:
265 divided by 90 is 2 with a remainder of 85.
Put 2 as the next digit of the answer. 
Result so far: 72812.0
If we subtract 180 from 265, we get 85.
Bring next digit (8) of the dividend behind the 85 and repeat the process: 858 / 90

On to step 8:
If we divide 858 by 90, we get 9 and a remainder of 48.
The number 9 becomes the next digit in our result. 
Result so far: 728129.0
Deduct 810 from 858 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 9:
90 goes into 480 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 728129.5
The remainder is 30 after subtracting 450 from 480.
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 10:
90 goes into 300 3 times with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 728129.53
If we take 270 away from 300, we end up 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.

Going ahead to step 11:
When dividing 300 by 90, we get 3 with a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 728129.533
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 728129.533 with a remaining 0.003.