We divide 398859 by 90
We want to divide 398859 by 90.

Advancing to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 90

On to step 2:
If we divide 39 by 90, we get 0 and a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 90

Advancing to step 3:
The number 90 fits into 398 4 times, leaving a remainder of 38.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 360 from 398 leaves us with 38.
Fetch the next digit (8) from the dividend, attach it to 38 and continue: 388 / 90

On to step 4:
If we divide 388 by 90, we get 4 and a remainder of 28.
The next digit of our result is 4. 
Result so far: 44.0
Subtracting 360 from 388 leaves us with 28.
Take the next digit (5) from the dividend and append it to 28, then repeat: 285 / 90

Moving on to step 5:
The number 90 fits into 285 3 times, leaving a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 443.0
Subtracting 270 from 285 leaves us with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 90

Going ahead to step 6:
90 can be fit into 159 1 times, resulting in a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 4431.0
The remainder is 69 after subtracting 90 from 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 7:
If we divide 690 by 90, we get 7 and a remainder of 60.
Record the quotient 7 as the next digit in the result. 
Result so far: 4431.7
Deduct 630 from 690 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 4431.76
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
When dividing 600 by 90, we get 6 with a remainder of 60.
The next digit of our result is 6. 
Result so far: 4431.766
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Our division results in 4431.766 with a remaining 0.006.