We divide 590872 by 90
The aim is to understand the frequency of 90 in 590872.

Advancing to step 1:
5 divided by 90 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 90

Going ahead to step 2:
When dividing 59 by 90, we get 0 with a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 59, we get 59.
Take the next digit (0) from the dividend and append it to 59, then repeat: 590 / 90

Advancing to step 3:
If we divide 590 by 90, we get 6 and a remainder of 50.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 540 from 590 leaves us with 50.
Grab the next digit (8) from the dividend, add it to 50, then carry on: 508 / 90

On to step 4:
90 can be fit into 508 5 times, resulting in a remainder of 58.
Write down 5 as next digit of the result. 
Result so far: 65.0
The remainder is 58 after subtracting 450 from 508.
Take the next digit (7) from the dividend and append it to 58, then repeat: 587 / 90

On to step 5:
90 can be fit into 587 6 times, resulting in a remainder of 47.
The number 6 becomes the next digit in our result. 
Result so far: 656.0
If we take 540 away from 587, we end up with 47.
Fetch the next digit (2) from the dividend, attach it to 47 and continue: 472 / 90

Advancing to step 6:
When dividing 472 by 90, we get 5 with a remainder of 22.
Use 5 as the next digit of our solution. 
Result so far: 6565.0
Deduct 450 from 472 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 7:
When dividing 220 by 90, we get 2 with a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 6565.2
The remainder is 40 after subtracting 180 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
If we divide 400 by 90, we get 4 and a remainder of 40.
The next digit of our result is 4. 
Result so far: 6565.24
Subtract 360 from 400 to 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.

Going ahead to step 9:
90 can be fit into 400 4 times, resulting in a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 6565.244
Deduct 360 from 400 and we're left 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.

Our division results in 6565.244 with a remaining 0.004.