Let's divide 431936 by 90
We're looking to find how many times 90 goes into 431936.

Going ahead to step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 90

Moving on to step 2:
90 goes into 43 0 times with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Grab the next digit (1) from the dividend, add it to 43, then carry on: 431 / 90

Moving on to step 3:
When dividing 431 by 90, we get 4 with a remainder of 71.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 360 from 431 and we're left with 71.
Append the next digit (9) from the dividend to 71 and continue with: 719 / 90

Going ahead to step 4:
90 goes into 719 7 times with a remainder of 89.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtract 630 from 719 to get 89.
Bring next digit (3) of the dividend behind the 89 and repeat the process: 893 / 90

Step 5:
When dividing 893 by 90, we get 9 with a remainder of 83.
Write down 9 as next digit of the result. 
Result so far: 479.0
If we subtract 810 from 893, we get 83.
Append the next digit (6) from the dividend to 83 and continue with: 836 / 90

Let's proceed to step 6:
When dividing 836 by 90, we get 9 with a remainder of 26.
The next digit of our result is 9. 
Result so far: 4799.0
Subtract 810 from 836 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 7:
If we divide 260 by 90, we get 2 and a remainder of 80.
Write down 2 as next digit of the result. 
Result so far: 4799.2
Deduct 180 from 260 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 8:
800 divided by 90 is 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 4799.28
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 9:
The number 90 fits into 800 8 times, leaving a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 4799.288
Deduct 720 from 800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 4799.288 with a remainder of 0.008.