We're dividing 396237 by 90 
We want to figure out the number of times 396237 can be divided by 90.

Moving on to step 1:
If we divide 3 by 90, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 90

Step 2:
If we divide 39 by 90, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Fetch the next digit (6) from the dividend, attach it to 39 and continue: 396 / 90

Advancing to step 3:
90 goes into 396 4 times with a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 360 from 396, we get 36.
Bring next digit (2) of the dividend behind the 36 and repeat the process: 362 / 90

Advancing to step 4:
If we divide 362 by 90, we get 4 and a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.0
Deduct 360 from 362 and we're left with 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 90

Going ahead to step 5:
The number 90 fits into 23 0 times, leaving a remainder of 23.
Record the quotient 0 as the next digit in the result. 
Result so far: 440.0
If we take 0 away from 23, we end up with 23.
Append the next digit (7) from the dividend to 23 and continue with: 237 / 90

Moving on to step 6:
When dividing 237 by 90, we get 2 with a remainder of 57.
Write down 2 as next digit of the result. 
Result so far: 4402.0
If we subtract 180 from 237, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 7:
The number 90 fits into 570 6 times, leaving a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 4402.6
Subtracting 540 from 570 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.

Advancing to step 8:
90 can be fit into 300 3 times, resulting in a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 4402.63
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.

Advancing to step 9:
300 divided by 90 is 3 with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 4402.633
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.

After the division, we end up with 4402.633 and a remainder of 0.003.