We divide 65991 by 90
We're looking to find how many times 90 goes into 65991.

Moving on to step 1:
The number 90 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 90

Step 2:
The number 90 fits into 65 0 times, leaving a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 65 after subtracting 0 from 65.
Include the next digit (9) from the dividend after 65, then repeat: 659 / 90

On to step 3:
90 can be fit into 659 7 times, resulting in a remainder of 29.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we take 630 away from 659, we end up with 29.
Fetch the next digit (9) from the dividend, attach it to 29 and continue: 299 / 90

Moving on to step 4:
When dividing 299 by 90, we get 3 with a remainder of 29.
Write down 3 as next digit of the result. 
Result so far: 73.0
The remainder is 29 after subtracting 270 from 299.
Bring next digit (1) of the dividend behind the 29 and repeat the process: 291 / 90

Let's proceed to step 5:
90 can be fit into 291 3 times, resulting in a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 733.0
The remainder is 21 after subtracting 270 from 291.
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 6:
90 goes into 210 2 times with a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 733.2
Subtract 180 from 210 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.

Advancing to step 7:
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: 733.23
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 8:
300 divided by 90 is 3 with a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 733.233
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.

In conclusion, the division gives 733.233 with a balance of 0.003.