We're dividing 599934 by 90 
The aim is to understand the frequency of 90 in 599934.

Advancing to step 1:
If we divide 5 by 90, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 90

Step 2:
If we divide 59 by 90, we get 0 and a remainder of 59.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 59, we end up with 59.
Take the next digit (9) from the dividend and append it to 59, then repeat: 599 / 90

Moving on to step 3:
If we divide 599 by 90, we get 6 and a remainder of 59.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 540 from 599 leaves us with 59.
Take the next digit (9) from the dividend and append it to 59, then repeat: 599 / 90

Moving on to step 4:
90 can be fit into 599 6 times, resulting in a remainder of 59.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
Subtract 540 from 599 to get 59.
Fetch the next digit (3) from the dividend, attach it to 59 and continue: 593 / 90

Advancing to step 5:
593 divided by 90 is 6 with a remainder of 53.
Write down 6 as next digit of the result. 
Result so far: 666.0
Subtract 540 from 593 to get 53.
Fetch the next digit (4) from the dividend, attach it to 53 and continue: 534 / 90

On to step 6:
The number 90 fits into 534 5 times, leaving a remainder of 84.
Put 5 as the next digit of the answer. 
Result so far: 6665.0
Subtract 450 from 534 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Going ahead to step 7:
90 goes into 840 9 times with a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 6665.9
Subtract 810 from 840 to 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.

On to step 8:
300 divided by 90 is 3 with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 6665.93
The remainder is 30 after subtracting 270 from 300.
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 9:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 6665.933
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 quotient of the division is 6665.933, and the remainder is 0.003.