431421 divided by 90 
Let's see how many times 90 fits into 431421.

Moving on to step 1:
90 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 90

Advancing to step 2:
If we divide 43 by 90, we get 0 and a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Grab the next digit (1) from the dividend, add it to 43, then carry on: 431 / 90

Let's proceed to step 3:
90 can be fit into 431 4 times, resulting in a remainder of 71.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 360 from 431 and we're left with 71.
Grab the next digit (4) from the dividend, add it to 71, then carry on: 714 / 90

Let's proceed to step 4:
The number 90 fits into 714 7 times, leaving a remainder of 84.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
Subtracting 630 from 714 leaves us with 84.
Include the next digit (2) from the dividend after 84, then repeat: 842 / 90

On to step 5:
90 goes into 842 9 times with a remainder of 32.
Write down 9 as next digit of the result. 
Result so far: 479.0
If we subtract 810 from 842, we get 32.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 90

Moving on to step 6:
When dividing 321 by 90, we get 3 with a remainder of 51.
Use 3 as the next digit of our solution. 
Result so far: 4793.0
If we take 270 away from 321, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

On to step 7:
If we divide 510 by 90, we get 5 and a remainder of 60.
Write down 5 as next digit of the result. 
Result so far: 4793.5
Deduct 450 from 510 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.

Going ahead to step 8:
If we divide 600 by 90, we get 6 and a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 4793.56
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 4793.566
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 4793.566 with a remaining 0.006.