438071 divided by 90 
We want to figure out the number of times 438071 can be divided by 90.

On to step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 90

Advancing to step 2:
43 divided by 90 is 0 with a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Fetch the next digit (8) from the dividend, attach it to 43 and continue: 438 / 90

Let's proceed to step 3:
438 divided by 90 is 4 with a remainder of 78.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 78 after subtracting 360 from 438.
Fetch the next digit (0) from the dividend, attach it to 78 and continue: 780 / 90

Let's proceed to step 4:
90 goes into 780 8 times with a remainder of 60.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Subtracting 720 from 780 leaves us with 60.
Grab the next digit (7) from the dividend, add it to 60, then carry on: 607 / 90

Going ahead to step 5:
The number 90 fits into 607 6 times, leaving a remainder of 67.
Record the quotient 6 as the next digit in the result. 
Result so far: 486.0
Subtracting 540 from 607 leaves us with 67.
Include the next digit (1) from the dividend after 67, then repeat: 671 / 90

Moving on to step 6:
The number 90 fits into 671 7 times, leaving a remainder of 41.
Write down 7 as next digit of the result. 
Result so far: 4867.0
If we take 630 away from 671, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 7:
If we divide 410 by 90, we get 4 and a remainder of 50.
The number 4 becomes the next digit in our result. 
Result so far: 4867.4
Deduct 360 from 410 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 8:
90 goes into 500 5 times with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 4867.45
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 9:
The number 90 fits into 500 5 times, leaving a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 4867.455
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 4867.455 and a remainder of 0.005.