We're dividing 390523 by 90 
Our goal is to divide 390523 by 90.

On to step 1:
90 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 90

Advancing to step 2:
The number 90 fits into 39 0 times, leaving a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (0) from the dividend to 39 and continue with: 390 / 90

Let's proceed to step 3:
If we divide 390 by 90, we get 4 and a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 360 away from 390, we end up with 30.
Include the next digit (5) from the dividend after 30, then repeat: 305 / 90

Let's proceed to step 4:
When dividing 305 by 90, we get 3 with a remainder of 35.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 270 away from 305, we end up with 35.
Grab the next digit (2) from the dividend, add it to 35, then carry on: 352 / 90

Moving on to step 5:
90 goes into 352 3 times with a remainder of 82.
Use 3 as the next digit of our solution. 
Result so far: 433.0
If we subtract 270 from 352, we get 82.
Bring next digit (3) of the dividend behind the 82 and repeat the process: 823 / 90

Moving on to step 6:
If we divide 823 by 90, we get 9 and a remainder of 13.
The next digit of our result is 9. 
Result so far: 4339.0
Subtracting 810 from 823 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
90 can be fit into 130 1 times, resulting in a remainder of 40.
The number 1 becomes the next digit in our result. 
Result so far: 4339.1
Subtracting 90 from 130 leaves us 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.

Step 8:
90 goes into 400 4 times with a remainder of 40.
The next digit of our result is 4. 
Result so far: 4339.14
If we take 360 away from 400, we end up 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.

Moving on to step 9:
When dividing 400 by 90, we get 4 with a remainder of 40.
The next digit of our result is 4. 
Result so far: 4339.144
Subtracting 360 from 400 leaves us 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.

Our division results in 4339.144 with a remaining 0.004.