Let's divide 163804 by 90
We're looking to find how many times 90 goes into 163804.

Advancing to step 1:
90 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 90

Step 2:
If we divide 16 by 90, we get 0 and a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 90

Going ahead to step 3:
163 divided by 90 is 1 with a remainder of 73.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 90 from 163 to get 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 90

Advancing to step 4:
90 can be fit into 738 8 times, resulting in a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 18.0
If we take 720 away from 738, we end up with 18.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 90

Let's proceed to step 5:
When dividing 180 by 90, we get 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 182.0
The remainder is 0 after subtracting 180 from 180.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 90

Going ahead to step 6:
90 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 1820.0
The remainder is 4 after subtracting 0 from 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
If we divide 40 by 90, we get 0 and a remainder of 40.
The next digit of our result is 0. 
Result so far: 1820.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
90 goes into 400 4 times with a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 1820.04
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
If we divide 400 by 90, we get 4 and a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 1820.044
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.

The final result is 1820.044 with a remainder of 0.004.