Let's divide 638615 by 90
Our goal is to divide 638615 by 90.

Advancing to step 1:
90 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 90

Let's proceed to step 2:
63 divided by 90 is 0 with a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 63 and we're left with 63.
Fetch the next digit (8) from the dividend, attach it to 63 and continue: 638 / 90

Advancing to step 3:
90 can be fit into 638 7 times, resulting in a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtract 630 from 638 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 90

Going ahead to step 4:
When dividing 86 by 90, we get 0 with a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 70.0
Subtracting 0 from 86 leaves us with 86.
Append the next digit (1) from the dividend to 86 and continue with: 861 / 90

Let's proceed to step 5:
90 goes into 861 9 times with a remainder of 51.
The number 9 becomes the next digit in our result. 
Result so far: 709.0
Subtracting 810 from 861 leaves us with 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 90

On to step 6:
If we divide 515 by 90, we get 5 and a remainder of 65.
The next digit of our result is 5. 
Result so far: 7095.0
The remainder is 65 after subtracting 450 from 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 7:
90 can be fit into 650 7 times, resulting in a remainder of 20.
Write down 7 as next digit of the result. 
Result so far: 7095.7
The remainder is 20 after subtracting 630 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
200 divided by 90 is 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 7095.72
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 7095.722
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 7095.722 with a remainder of 0.002.