We divide 586821 by 90
The aim is to understand the frequency of 90 in 586821.

Moving on to step 1:
The number 90 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 90

Let's proceed to step 2:
58 divided by 90 is 0 with a remainder of 58.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 58 leaves us with 58.
Fetch the next digit (6) from the dividend, attach it to 58 and continue: 586 / 90

Let's proceed to step 3:
When dividing 586 by 90, we get 6 with a remainder of 46.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 540 from 586 leaves us with 46.
Bring next digit (8) of the dividend behind the 46 and repeat the process: 468 / 90

Moving on to step 4:
468 divided by 90 is 5 with a remainder of 18.
Write down 5 as next digit of the result. 
Result so far: 65.0
Subtracting 450 from 468 leaves us with 18.
Include the next digit (2) from the dividend after 18, then repeat: 182 / 90

On to step 5:
90 goes into 182 2 times with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 652.0
If we subtract 180 from 182, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 90

On to step 6:
21 divided by 90 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 6520.0
If we take 0 away from 21, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
If we divide 210 by 90, we get 2 and a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 6520.2
The remainder is 30 after subtracting 180 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
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: 6520.23
Subtracting 270 from 300 leaves us 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.

Let's proceed to step 9:
When dividing 300 by 90, we get 3 with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 6520.233
Subtracting 270 from 300 leaves us 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.

The final result is 6520.233 with a remainder of 0.003.