90121913 ÷ 63 
Our goal is to divide 90121913 by 63.

Advancing to step 1:
63 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 63

Step 2:
The number 63 fits into 90 1 times, leaving a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 27 after subtracting 63 from 90.
Take the next digit (1) from the dividend and append it to 27, then repeat: 271 / 63

Moving on to step 3:
The number 63 fits into 271 4 times, leaving a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we take 252 away from 271, we end up with 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 63

Going ahead to step 4:
When dividing 192 by 63, we get 3 with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 143.0
The remainder is 3 after subtracting 189 from 192.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 63

Advancing to step 5:
31 divided by 63 is 0 with a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 1430.0
Subtract 0 from 31 to get 31.
Include the next digit (9) from the dividend after 31, then repeat: 319 / 63

On to step 6:
If we divide 319 by 63, we get 5 and a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 14305.0
Deduct 315 from 319 and we're left with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 63

Let's proceed to step 7:
63 goes into 41 0 times with a remainder of 41.
The number 0 becomes the next digit in our result. 
Result so far: 143050.0
Subtract 0 from 41 to get 41.
Take the next digit (3) from the dividend and append it to 41, then repeat: 413 / 63

On to step 8:
When dividing 413 by 63, we get 6 with a remainder of 35.
Put 6 as the next digit of the answer. 
Result so far: 1430506.0
The remainder is 35 after subtracting 378 from 413.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 9:
350 divided by 63 is 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 1430506.5
If we take 315 away from 350, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 10:
If we divide 350 by 63, we get 5 and a remainder of 35.
The next digit of our result is 5. 
Result so far: 1430506.55
Subtracting 315 from 350 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final result is 1430506.55 with a remainder of 0.035.