Let's divide 638559 by 90
We want to figure out the number of times 638559 can be divided by 90.

Going ahead to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 90

Step 2:
90 can be fit into 63 0 times, resulting in a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Grab the next digit (8) from the dividend, add it to 63, then carry on: 638 / 90

Going ahead to step 3:
The number 90 fits into 638 7 times, leaving a remainder of 8.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 630 from 638 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 90

Going ahead to step 4:
90 can be fit into 85 0 times, resulting in a remainder of 85.
The next digit of our result is 0. 
Result so far: 70.0
If we take 0 away from 85, we end up with 85.
Bring next digit (5) of the dividend behind the 85 and repeat the process: 855 / 90

On to step 5:
855 divided by 90 is 9 with a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 709.0
The remainder is 45 after subtracting 810 from 855.
Bring next digit (9) of the dividend behind the 45 and repeat the process: 459 / 90

Going ahead to step 6:
The number 90 fits into 459 5 times, leaving a remainder of 9.
The next digit of our result is 5. 
Result so far: 7095.0
Subtract 450 from 459 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
90 can be fit into 90 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 7095.1
Deduct 90 from 90 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
When dividing 0 by 90, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 7095.1
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 90 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 7095.1
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 7095.1, with a leftover of 0.0.