We divide 731567 by 90
The aim is to understand the frequency of 90 in 731567.

On to step 1:
The number 90 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 90

Going ahead to step 2:
73 divided by 90 is 0 with a remainder of 73.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 73 and we're left with 73.
Take the next digit (1) from the dividend and append it to 73, then repeat: 731 / 90

Let's proceed to step 3:
90 can be fit into 731 8 times, resulting in a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we take 720 away from 731, we end up with 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 90

Step 4:
90 goes into 115 1 times with a remainder of 25.
Use 1 as the next digit of our solution. 
Result so far: 81.0
The remainder is 25 after subtracting 90 from 115.
Include the next digit (6) from the dividend after 25, then repeat: 256 / 90

On to step 5:
256 divided by 90 is 2 with a remainder of 76.
Use 2 as the next digit of our solution. 
Result so far: 812.0
Deduct 180 from 256 and we're left with 76.
Bring next digit (7) of the dividend behind the 76 and repeat the process: 767 / 90

Going ahead to step 6:
If we divide 767 by 90, we get 8 and a remainder of 47.
Write down 8 as next digit of the result. 
Result so far: 8128.0
The remainder is 47 after subtracting 720 from 767.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 7:
When dividing 470 by 90, we get 5 with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 8128.5
If we take 450 away from 470, we end up 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.

Advancing to step 8:
If we divide 200 by 90, we get 2 and a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 8128.52
Subtract 180 from 200 to get 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:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 8128.522
If we take 180 away from 200, we end up 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.

The quotient of the division is 8128.522, and the remainder is 0.002.