We look at the division of 36399 by 90 
We're looking to find how many times 90 goes into 36399.

Advancing to step 1:
If we divide 3 by 90, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 90

Advancing to step 2:
If we divide 36 by 90, we get 0 and a remainder of 36.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 36, we get 36.
Bring next digit (3) of the dividend behind the 36 and repeat the process: 363 / 90

On to step 3:
When dividing 363 by 90, we get 4 with a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 360 from 363 to get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 90

Advancing to step 4:
90 can be fit into 39 0 times, resulting in a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 40.0
Deduct 0 from 39 and we're left with 39.
Take the next digit (9) from the dividend and append it to 39, then repeat: 399 / 90

Advancing to step 5:
90 can be fit into 399 4 times, resulting in a remainder of 39.
Put 4 as the next digit of the answer. 
Result so far: 404.0
If we take 360 away from 399, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 6:
The number 90 fits into 390 4 times, leaving a remainder of 30.
Put 4 as the next digit of the answer. 
Result so far: 404.4
Subtracting 360 from 390 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.

Step 7:
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: 404.43
If we take 270 away from 300, we end up 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.

Advancing to step 8:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 404.433
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.

The quotient of the division is 404.433, and the remainder is 0.003.