We divide 389404 by 90
We're looking to find how many times 90 goes into 389404.

On to step 1:
If we divide 3 by 90, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 90

Moving on to step 2:
If we divide 38 by 90, we get 0 and a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 38 after subtracting 0 from 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 90

Moving on to step 3:
When dividing 389 by 90, we get 4 with a remainder of 29.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 360 from 389 leaves us with 29.
Grab the next digit (4) from the dividend, add it to 29, then carry on: 294 / 90

Let's proceed to step 4:
90 goes into 294 3 times with a remainder of 24.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Deduct 270 from 294 and we're left with 24.
Include the next digit (0) from the dividend after 24, then repeat: 240 / 90

Let's proceed to step 5:
The number 90 fits into 240 2 times, leaving a remainder of 60.
Put 2 as the next digit of the answer. 
Result so far: 432.0
Deduct 180 from 240 and we're left with 60.
Grab the next digit (4) from the dividend, add it to 60, then carry on: 604 / 90

Advancing to step 6:
If we divide 604 by 90, we get 6 and a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 4326.0
The remainder is 64 after subtracting 540 from 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 7:
90 goes into 640 7 times with a remainder of 10.
The number 7 becomes the next digit in our result. 
Result so far: 4326.7
Deduct 630 from 640 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
100 divided by 90 is 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 4326.71
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
90 goes into 100 1 times with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 4326.711
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 4326.711 with a remaining 0.001.